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Finding the Fourth Proportional to 386,697.42, 580,046.18 and 120,479.40

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Solution

The fourth proportional to 386,697.42, 580,046.18 and 120,479.40 is: 180,719.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,697.42 : 580,046.18 = 120,479.40 : x
  2. Step 2: Convert to fraction form
    386,697.42/580,046.18 = 120,479.40/x
  3. Step 3: Cross multiply
    386,697.42x = 580,046.18 × 120,479.40
  4. Step 4: Simplify right side
    386,697.42x = 69,883,615,136.30
  5. Step 5: Solve for x
    x = 69,883,615,136.30/386,697.42
  6. Step 6: Final answer
    x = 180,719.11

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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.