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Finding the Fourth Proportional to 390,618.78, 585,734.31 and 124,344.66

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Solution

The fourth proportional to 390,618.78, 585,734.31 and 124,344.66 is: 186,455.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,618.78 : 585,734.31 = 124,344.66 : x
  2. Step 2: Convert to fraction form
    390,618.78/585,734.31 = 124,344.66/x
  3. Step 3: Cross multiply
    390,618.78x = 585,734.31 × 124,344.66
  4. Step 4: Simplify right side
    390,618.78x = 72,832,933,627.28
  5. Step 5: Solve for x
    x = 72,832,933,627.28/390,618.78
  6. Step 6: Final answer
    x = 186,455.28

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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.