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Finding the Fourth Proportional to 386,612.20, 580,064.10 and 187,109.20

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Solution

The fourth proportional to 386,612.20, 580,064.10 and 187,109.20 is: 280,734.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,612.20 : 580,064.10 = 187,109.20 : x
  2. Step 2: Convert to fraction form
    386,612.20/580,064.10 = 187,109.20/x
  3. Step 3: Cross multiply
    386,612.20x = 580,064.10 × 187,109.20
  4. Step 4: Simplify right side
    386,612.20x = 108,535,329,699.72
  5. Step 5: Solve for x
    x = 108,535,329,699.72/386,612.20
  6. Step 6: Final answer
    x = 280,734.36

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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.