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Finding the Fourth Proportional to 986.87, 1,478.89 and 724.81

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Solution

The fourth proportional to 986.87, 1,478.89 and 724.81 is: 1,086.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.87 : 1,478.89 = 724.81 : x
  2. Step 2: Convert to fraction form
    986.87/1,478.89 = 724.81/x
  3. Step 3: Cross multiply
    986.87x = 1,478.89 × 724.81
  4. Step 4: Simplify right side
    986.87x = 1,071,914.30
  5. Step 5: Solve for x
    x = 1,071,914.30/986.87
  6. Step 6: Final answer
    x = 1,086.18

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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.