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Finding the Fourth Proportional to 624.74, 861.44 and 403.40

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Solution

The fourth proportional to 624.74, 861.44 and 403.40 is: 556.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.74 : 861.44 = 403.40 : x
  2. Step 2: Convert to fraction form
    624.74/861.44 = 403.40/x
  3. Step 3: Cross multiply
    624.74x = 861.44 × 403.40
  4. Step 4: Simplify right side
    624.74x = 347,504.90
  5. Step 5: Solve for x
    x = 347,504.90/624.74
  6. Step 6: Final answer
    x = 556.24

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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.