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Finding the Fourth Proportional to 624.56, 861.32 and 427.68

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Solution

The fourth proportional to 624.56, 861.32 and 427.68 is: 589.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.56 : 861.32 = 427.68 : x
  2. Step 2: Convert to fraction form
    624.56/861.32 = 427.68/x
  3. Step 3: Cross multiply
    624.56x = 861.32 × 427.68
  4. Step 4: Simplify right side
    624.56x = 368,369.34
  5. Step 5: Solve for x
    x = 368,369.34/624.56
  6. Step 6: Final answer
    x = 589.81

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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.