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Finding the Fourth Proportional to 624.36, 861.24 and 459

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Solution

The fourth proportional to 624.36, 861.24 and 459 is: 633.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.36 : 861.24 = 459 : x
  2. Step 2: Convert to fraction form
    624.36/861.24 = 459/x
  3. Step 3: Cross multiply
    624.36x = 861.24 × 459
  4. Step 4: Simplify right side
    624.36x = 395,309.16
  5. Step 5: Solve for x
    x = 395,309.16/624.36
  6. Step 6: Final answer
    x = 633.14

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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.