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Finding the Fourth Proportional to 390,236.90, 585,230.78 and 123,935.13

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Solution

The fourth proportional to 390,236.90, 585,230.78 and 123,935.13 is: 185,863.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,236.90 : 585,230.78 = 123,935.13 : x
  2. Step 2: Convert to fraction form
    390,236.90/585,230.78 = 123,935.13/x
  3. Step 3: Cross multiply
    390,236.90x = 585,230.78 × 123,935.13
  4. Step 4: Simplify right side
    390,236.90x = 72,530,652,799.30
  5. Step 5: Solve for x
    x = 72,530,652,799.30/390,236.90
  6. Step 6: Final answer
    x = 185,863.13

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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.