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Finding the Fourth Proportional to 390,644.02, 539,100.12 and 220,874.50

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Solution

The fourth proportional to 390,644.02, 539,100.12 and 220,874.50 is: 304,813.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,644.02 : 539,100.12 = 220,874.50 : x
  2. Step 2: Convert to fraction form
    390,644.02/539,100.12 = 220,874.50/x
  3. Step 3: Cross multiply
    390,644.02x = 539,100.12 × 220,874.50
  4. Step 4: Simplify right side
    390,644.02x = 119,073,469,454.94
  5. Step 5: Solve for x
    x = 119,073,469,454.94/390,644.02
  6. Step 6: Final answer
    x = 304,813.24

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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.