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Finding the Fourth Proportional to 624.22, 861.78 and 403.50

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Solution

The fourth proportional to 624.22, 861.78 and 403.50 is: 557.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.22 : 861.78 = 403.50 : x
  2. Step 2: Convert to fraction form
    624.22/861.78 = 403.50/x
  3. Step 3: Cross multiply
    624.22x = 861.78 × 403.50
  4. Step 4: Simplify right side
    624.22x = 347,728.23
  5. Step 5: Solve for x
    x = 347,728.23/624.22
  6. Step 6: Final answer
    x = 557.06

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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.