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Finding the Fourth Proportional to 986.93, 1,478.98 and 724.88

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Solution

The fourth proportional to 986.93, 1,478.98 and 724.88 is: 1,086.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.93 : 1,478.98 = 724.88 : x
  2. Step 2: Convert to fraction form
    986.93/1,478.98 = 724.88/x
  3. Step 3: Cross multiply
    986.93x = 1,478.98 × 724.88
  4. Step 4: Simplify right side
    986.93x = 1,072,077.44
  5. Step 5: Solve for x
    x = 1,072,077.44/986.93
  6. Step 6: Final answer
    x = 1,086.28

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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.