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Finding the Fourth Proportional to 997.86, 1,376.12 and 624.72

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Solution

The fourth proportional to 997.86, 1,376.12 and 624.72 is: 861.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.86 : 1,376.12 = 624.72 : x
  2. Step 2: Convert to fraction form
    997.86/1,376.12 = 624.72/x
  3. Step 3: Cross multiply
    997.86x = 1,376.12 × 624.72
  4. Step 4: Simplify right side
    997.86x = 859,689.69
  5. Step 5: Solve for x
    x = 859,689.69/997.86
  6. Step 6: Final answer
    x = 861.53

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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.