Home / 128,680.20-177,570.72-72,090.36

Finding the Fourth Proportional to 128,680.20, 177,570.72 and 72,090.36

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Solution

The fourth proportional to 128,680.20, 177,570.72 and 72,090.36 is: 99,480.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,680.20 : 177,570.72 = 72,090.36 : x
  2. Step 2: Convert to fraction form
    128,680.20/177,570.72 = 72,090.36/x
  3. Step 3: Cross multiply
    128,680.20x = 177,570.72 × 72,090.36
  4. Step 4: Simplify right side
    128,680.20x = 12,801,137,130.26
  5. Step 5: Solve for x
    x = 12,801,137,130.26/128,680.20
  6. Step 6: Final answer
    x = 99,480.24

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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.