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Finding the Fourth Proportional to 281,345.60, 421,952.16 and 81,613.28

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Solution

The fourth proportional to 281,345.60, 421,952.16 and 81,613.28 is: 122,400.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,345.60 : 421,952.16 = 81,613.28 : x
  2. Step 2: Convert to fraction form
    281,345.60/421,952.16 = 81,613.28/x
  3. Step 3: Cross multiply
    281,345.60x = 421,952.16 × 81,613.28
  4. Step 4: Simplify right side
    281,345.60x = 34,436,899,780.68
  5. Step 5: Solve for x
    x = 34,436,899,780.68/281,345.60
  6. Step 6: Final answer
    x = 122,400.70

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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.