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Finding the Fourth Proportional to 979.29, 1,350.70 and 624.86

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Solution

The fourth proportional to 979.29, 1,350.70 and 624.86 is: 861.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.29 : 1,350.70 = 624.86 : x
  2. Step 2: Convert to fraction form
    979.29/1,350.70 = 624.86/x
  3. Step 3: Cross multiply
    979.29x = 1,350.70 × 624.86
  4. Step 4: Simplify right side
    979.29x = 843,998.40
  5. Step 5: Solve for x
    x = 843,998.40/979.29
  6. Step 6: Final answer
    x = 861.85

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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.