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Finding the Fourth Proportional to 390,350.39, 585,126.79 and 221,514.12

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Solution

The fourth proportional to 390,350.39, 585,126.79 and 221,514.12 is: 332,044.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,350.39 : 585,126.79 = 221,514.12 : x
  2. Step 2: Convert to fraction form
    390,350.39/585,126.79 = 221,514.12/x
  3. Step 3: Cross multiply
    390,350.39x = 585,126.79 × 221,514.12
  4. Step 4: Simplify right side
    390,350.39x = 129,613,845,421.49
  5. Step 5: Solve for x
    x = 129,613,845,421.49/390,350.39
  6. Step 6: Final answer
    x = 332,044.88

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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.