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Finding the Fourth Proportional to 71,685.76, 98,877.36 and 65,737.12

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Solution

The fourth proportional to 71,685.76, 98,877.36 and 65,737.12 is: 90,672.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,685.76 : 98,877.36 = 65,737.12 : x
  2. Step 2: Convert to fraction form
    71,685.76/98,877.36 = 65,737.12/x
  3. Step 3: Cross multiply
    71,685.76x = 98,877.36 × 65,737.12
  4. Step 4: Simplify right side
    71,685.76x = 6,499,912,879.60
  5. Step 5: Solve for x
    x = 6,499,912,879.60/71,685.76
  6. Step 6: Final answer
    x = 90,672.30

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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.