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Finding the Fourth Proportional to 626.55, 940.38 and 318.61

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Solution

The fourth proportional to 626.55, 940.38 and 318.61 is: 478.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.55 : 940.38 = 318.61 : x
  2. Step 2: Convert to fraction form
    626.55/940.38 = 318.61/x
  3. Step 3: Cross multiply
    626.55x = 940.38 × 318.61
  4. Step 4: Simplify right side
    626.55x = 299,614.47
  5. Step 5: Solve for x
    x = 299,614.47/626.55
  6. Step 6: Final answer
    x = 478.20

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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.