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Finding the Fourth Proportional to 39,766.70, 54,875.72 and 21,861.70

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Solution

The fourth proportional to 39,766.70, 54,875.72 and 21,861.70 is: 30,167.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,766.70 : 54,875.72 = 21,861.70 : x
  2. Step 2: Convert to fraction form
    39,766.70/54,875.72 = 21,861.70/x
  3. Step 3: Cross multiply
    39,766.70x = 54,875.72 × 21,861.70
  4. Step 4: Simplify right side
    39,766.70x = 1,199,676,253.55
  5. Step 5: Solve for x
    x = 1,199,676,253.55/39,766.70
  6. Step 6: Final answer
    x = 30,167.86

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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.