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Finding the Fourth Proportional to 71,850.79, 107,776.15 and 21,931.13

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Solution

The fourth proportional to 71,850.79, 107,776.15 and 21,931.13 is: 32,896.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,850.79 : 107,776.15 = 21,931.13 : x
  2. Step 2: Convert to fraction form
    71,850.79/107,776.15 = 21,931.13/x
  3. Step 3: Cross multiply
    71,850.79x = 107,776.15 × 21,931.13
  4. Step 4: Simplify right side
    71,850.79x = 2,363,652,756.55
  5. Step 5: Solve for x
    x = 2,363,652,756.55/71,850.79
  6. Step 6: Final answer
    x = 32,896.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.