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Finding the Fourth Proportional to 986.56, 1,478.42 and 724.50

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Solution

The fourth proportional to 986.56, 1,478.42 and 724.50 is: 1,085.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.56 : 1,478.42 = 724.50 : x
  2. Step 2: Convert to fraction form
    986.56/1,478.42 = 724.50/x
  3. Step 3: Cross multiply
    986.56x = 1,478.42 × 724.50
  4. Step 4: Simplify right side
    986.56x = 1,071,114.35
  5. Step 5: Solve for x
    x = 1,071,114.35/986.56
  6. Step 6: Final answer
    x = 1,085.71

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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.