Home / 128,700,345,173.64-177,631,065,965.60-85,219,939,693.32

Finding the Fourth Proportional to 128,700,345,173.64, 177,631,065,965.60 and 85,219,939,693.32

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Solution

The fourth proportional to 128,700,345,173.64, 177,631,065,965.60 and 85,219,939,693.32 is: 117,619,798,989.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,700,345,173.64 : 177,631,065,965.60 = 85,219,939,693.32 : x
  2. Step 2: Convert to fraction form
    128,700,345,173.64/177,631,065,965.60 = 85,219,939,693.32/x
  3. Step 3: Cross multiply
    128,700,345,173.64x = 177,631,065,965.60 × 85,219,939,693.32
  4. Step 4: Simplify right side
    128,700,345,173.64x = 15,137,708,729,248,581,156,864
  5. Step 5: Solve for x
    x = 15,137,708,729,248,581,156,864/128,700,345,173.64
  6. Step 6: Final answer
    x = 117,619,798,989.86

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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.