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Finding the Fourth Proportional to 71,686.76, 98,927.19 and 39,855.38

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Solution

The fourth proportional to 71,686.76, 98,927.19 and 39,855.38 is: 55,000.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,686.76 : 98,927.19 = 39,855.38 : x
  2. Step 2: Convert to fraction form
    71,686.76/98,927.19 = 39,855.38/x
  3. Step 3: Cross multiply
    71,686.76x = 98,927.19 × 39,855.38
  4. Step 4: Simplify right side
    71,686.76x = 3,942,780,255.15
  5. Step 5: Solve for x
    x = 3,942,780,255.15/71,686.76
  6. Step 6: Final answer
    x = 55,000.12

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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.