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Finding the Fourth Proportional to 624.64, 861.09 and 427.81

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Solution

The fourth proportional to 624.64, 861.09 and 427.81 is: 589.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.64 : 861.09 = 427.81 : x
  2. Step 2: Convert to fraction form
    624.64/861.09 = 427.81/x
  3. Step 3: Cross multiply
    624.64x = 861.09 × 427.81
  4. Step 4: Simplify right side
    624.64x = 368,382.91
  5. Step 5: Solve for x
    x = 368,382.91/624.64
  6. Step 6: Final answer
    x = 589.75

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.