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Finding the Fourth Proportional to 390,644.77, 539,101.16 and 220,875.25

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Solution

The fourth proportional to 390,644.77, 539,101.16 and 220,875.25 is: 304,814.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,644.77 : 539,101.16 = 220,875.25 : x
  2. Step 2: Convert to fraction form
    390,644.77/539,101.16 = 220,875.25/x
  3. Step 3: Cross multiply
    390,644.77x = 539,101.16 × 220,875.25
  4. Step 4: Simplify right side
    390,644.77x = 119,074,103,490.29
  5. Step 5: Solve for x
    x = 119,074,103,490.29/390,644.77
  6. Step 6: Final answer
    x = 304,814.28

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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.