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Finding the Fourth Proportional to 491,613.18, 678,439.32 and 276,761.38

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Solution

The fourth proportional to 491,613.18, 678,439.32 and 276,761.38 is: 381,938.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,613.18 : 678,439.32 = 276,761.38 : x
  2. Step 2: Convert to fraction form
    491,613.18/678,439.32 = 276,761.38/x
  3. Step 3: Cross multiply
    491,613.18x = 678,439.32 × 276,761.38
  4. Step 4: Simplify right side
    491,613.18x = 187,765,802,449.46
  5. Step 5: Solve for x
    x = 187,765,802,449.46/491,613.18
  6. Step 6: Final answer
    x = 381,938.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.