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Finding the Fourth Proportional to 128,763.16, 177,689.88 and 71,401.56

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Solution

The fourth proportional to 128,763.16, 177,689.88 and 71,401.56 is: 98,532.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,763.16 : 177,689.88 = 71,401.56 : x
  2. Step 2: Convert to fraction form
    128,763.16/177,689.88 = 71,401.56/x
  3. Step 3: Cross multiply
    128,763.16x = 177,689.88 × 71,401.56
  4. Step 4: Simplify right side
    128,763.16x = 12,687,335,010.44
  5. Step 5: Solve for x
    x = 12,687,335,010.44/128,763.16
  6. Step 6: Final answer
    x = 98,532.34

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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.