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Finding the Fourth Proportional to 386,654.72, 579,959 and 120,377.76

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Solution

The fourth proportional to 386,654.72, 579,959 and 120,377.76 is: 180,559.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,654.72 : 579,959 = 120,377.76 : x
  2. Step 2: Convert to fraction form
    386,654.72/579,959 = 120,377.76/x
  3. Step 3: Cross multiply
    386,654.72x = 579,959 × 120,377.76
  4. Step 4: Simplify right side
    386,654.72x = 69,814,165,311.84
  5. Step 5: Solve for x
    x = 69,814,165,311.84/386,654.72
  6. Step 6: Final answer
    x = 180,559.45

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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.