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Finding the Fourth Proportional to 65,471.43, 90,348.28 and 40,020.55

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Solution

The fourth proportional to 65,471.43, 90,348.28 and 40,020.55 is: 55,226.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,471.43 : 90,348.28 = 40,020.55 : x
  2. Step 2: Convert to fraction form
    65,471.43/90,348.28 = 40,020.55/x
  3. Step 3: Cross multiply
    65,471.43x = 90,348.28 × 40,020.55
  4. Step 4: Simplify right side
    65,471.43x = 3,615,787,857.15
  5. Step 5: Solve for x
    x = 3,615,787,857.15/65,471.43
  6. Step 6: Final answer
    x = 55,226.96

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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.