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Finding the Fourth Proportional to 390,645.27, 539,101.85 and 220,875.75

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Solution

The fourth proportional to 390,645.27, 539,101.85 and 220,875.75 is: 304,814.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,645.27 : 539,101.85 = 220,875.75 : x
  2. Step 2: Convert to fraction form
    390,645.27/539,101.85 = 220,875.75/x
  3. Step 3: Cross multiply
    390,645.27x = 539,101.85 × 220,875.75
  4. Step 4: Simplify right side
    390,645.27x = 119,074,524,340.76
  5. Step 5: Solve for x
    x = 119,074,524,340.76/390,645.27
  6. Step 6: Final answer
    x = 304,814.97

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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.