Home / 128,700,345,172.64-177,631,065,964.22-85,219,939,692.32

Finding the Fourth Proportional to 128,700,345,172.64, 177,631,065,964.22 and 85,219,939,692.32

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Solution

The fourth proportional to 128,700,345,172.64, 177,631,065,964.22 and 85,219,939,692.32 is: 117,619,798,988.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,700,345,172.64 : 177,631,065,964.22 = 85,219,939,692.32 : x
  2. Step 2: Convert to fraction form
    128,700,345,172.64/177,631,065,964.22 = 85,219,939,692.32/x
  3. Step 3: Cross multiply
    128,700,345,172.64x = 177,631,065,964.22 × 85,219,939,692.32
  4. Step 4: Simplify right side
    128,700,345,172.64x = 15,137,708,728,953,346,195,456
  5. Step 5: Solve for x
    x = 15,137,708,728,953,346,195,456/128,700,345,172.64
  6. Step 6: Final answer
    x = 117,619,798,988.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.