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Finding the Fourth Proportional to 71,518.68, 98,694.86 and 39,686.90

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Solution

The fourth proportional to 71,518.68, 98,694.86 and 39,686.90 is: 54,767.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,518.68 : 98,694.86 = 39,686.90 : x
  2. Step 2: Convert to fraction form
    71,518.68/98,694.86 = 39,686.90/x
  3. Step 3: Cross multiply
    71,518.68x = 98,694.86 × 39,686.90
  4. Step 4: Simplify right side
    71,518.68x = 3,916,892,347.43
  5. Step 5: Solve for x
    x = 3,916,892,347.43/71,518.68
  6. Step 6: Final answer
    x = 54,767.40

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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.