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Finding the Fourth Proportional to 390,726.72, 585,659.52 and 255,628.44

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Solution

The fourth proportional to 390,726.72, 585,659.52 and 255,628.44 is: 383,160.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,726.72 : 585,659.52 = 255,628.44 : x
  2. Step 2: Convert to fraction form
    390,726.72/585,659.52 = 255,628.44/x
  3. Step 3: Cross multiply
    390,726.72x = 585,659.52 × 255,628.44
  4. Step 4: Simplify right side
    390,726.72x = 149,711,229,468.75
  5. Step 5: Solve for x
    x = 149,711,229,468.75/390,726.72
  6. Step 6: Final answer
    x = 383,160.97

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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.