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Finding the Fourth Proportional to 624.84, 861.96 and 403.72

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Solution

The fourth proportional to 624.84, 861.96 and 403.72 is: 556.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.84 : 861.96 = 403.72 : x
  2. Step 2: Convert to fraction form
    624.84/861.96 = 403.72/x
  3. Step 3: Cross multiply
    624.84x = 861.96 × 403.72
  4. Step 4: Simplify right side
    624.84x = 347,990.49
  5. Step 5: Solve for x
    x = 347,990.49/624.84
  6. Step 6: Final answer
    x = 556.93

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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.