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Finding the Fourth Proportional to 624.78, 939.24 and 443.49

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Solution

The fourth proportional to 624.78, 939.24 and 443.49 is: 666.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.78 : 939.24 = 443.49 : x
  2. Step 2: Convert to fraction form
    624.78/939.24 = 443.49/x
  3. Step 3: Cross multiply
    624.78x = 939.24 × 443.49
  4. Step 4: Simplify right side
    624.78x = 416,543.55
  5. Step 5: Solve for x
    x = 416,543.55/624.78
  6. Step 6: Final answer
    x = 666.70

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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.