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Finding the Fourth Proportional to 40,685.20, 61,027.80 and 21,002.20

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Solution

The fourth proportional to 40,685.20, 61,027.80 and 21,002.20 is: 31,503.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,685.20 : 61,027.80 = 21,002.20 : x
  2. Step 2: Convert to fraction form
    40,685.20/61,027.80 = 21,002.20/x
  3. Step 3: Cross multiply
    40,685.20x = 61,027.80 × 21,002.20
  4. Step 4: Simplify right side
    40,685.20x = 1,281,718,061.16
  5. Step 5: Solve for x
    x = 1,281,718,061.16/40,685.20
  6. Step 6: Final answer
    x = 31,503.30

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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.