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Finding the Fourth Proportional to 624.36, 861.78 and 427.80

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Solution

The fourth proportional to 624.36, 861.78 and 427.80 is: 590.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.36 : 861.78 = 427.80 : x
  2. Step 2: Convert to fraction form
    624.36/861.78 = 427.80/x
  3. Step 3: Cross multiply
    624.36x = 861.78 × 427.80
  4. Step 4: Simplify right side
    624.36x = 368,669.48
  5. Step 5: Solve for x
    x = 368,669.48/624.36
  6. Step 6: Final answer
    x = 590.48

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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.