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Finding the Fourth Proportional to 128,294.88, 177,047.12 and 71,706.20

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Solution

The fourth proportional to 128,294.88, 177,047.12 and 71,706.20 is: 98,954.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,294.88 : 177,047.12 = 71,706.20 : x
  2. Step 2: Convert to fraction form
    128,294.88/177,047.12 = 71,706.20/x
  3. Step 3: Cross multiply
    128,294.88x = 177,047.12 × 71,706.20
  4. Step 4: Simplify right side
    128,294.88x = 12,695,376,196.14
  5. Step 5: Solve for x
    x = 12,695,376,196.14/128,294.88
  6. Step 6: Final answer
    x = 98,954.66

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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.