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Finding the Fourth Proportional to 128,130.72, 176,829.12 and 71,540.88

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Solution

The fourth proportional to 128,130.72, 176,829.12 and 71,540.88 is: 98,731.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,130.72 : 176,829.12 = 71,540.88 : x
  2. Step 2: Convert to fraction form
    128,130.72/176,829.12 = 71,540.88/x
  3. Step 3: Cross multiply
    128,130.72x = 176,829.12 × 71,540.88
  4. Step 4: Simplify right side
    128,130.72x = 12,650,510,854.43
  5. Step 5: Solve for x
    x = 12,650,510,854.43/128,130.72
  6. Step 6: Final answer
    x = 98,731.29

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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.