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Finding the Fourth Proportional to 71,322.87, 98,421.26 and 39,489.87

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Solution

The fourth proportional to 71,322.87, 98,421.26 and 39,489.87 is: 54,493.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,322.87 : 98,421.26 = 39,489.87 : x
  2. Step 2: Convert to fraction form
    71,322.87/98,421.26 = 39,489.87/x
  3. Step 3: Cross multiply
    71,322.87x = 98,421.26 × 39,489.87
  4. Step 4: Simplify right side
    71,322.87x = 3,886,642,565.19
  5. Step 5: Solve for x
    x = 3,886,642,565.19/71,322.87
  6. Step 6: Final answer
    x = 54,493.64

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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.