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Finding the Fourth Proportional to 390,350.89, 585,127.54 and 221,514.62

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Solution

The fourth proportional to 390,350.89, 585,127.54 and 221,514.62 is: 332,045.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,350.89 : 585,127.54 = 221,514.62 : x
  2. Step 2: Convert to fraction form
    390,350.89/585,127.54 = 221,514.62/x
  3. Step 3: Cross multiply
    390,350.89x = 585,127.54 × 221,514.62
  4. Step 4: Simplify right side
    390,350.89x = 129,614,303,567.06
  5. Step 5: Solve for x
    x = 129,614,303,567.06/390,350.89
  6. Step 6: Final answer
    x = 332,045.62

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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.