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Finding the Fourth Proportional to 724.75, 1,086.89 and 609.93

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Solution

The fourth proportional to 724.75, 1,086.89 and 609.93 is: 914.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.75 : 1,086.89 = 609.93 : x
  2. Step 2: Convert to fraction form
    724.75/1,086.89 = 609.93/x
  3. Step 3: Cross multiply
    724.75x = 1,086.89 × 609.93
  4. Step 4: Simplify right side
    724.75x = 662,923.77
  5. Step 5: Solve for x
    x = 662,923.77/724.75
  6. Step 6: Final answer
    x = 914.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.