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Finding the Fourth Proportional to 724.32, 1,079.61 and 718.65

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Solution

The fourth proportional to 724.32, 1,079.61 and 718.65 is: 1,071.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.32 : 1,079.61 = 718.65 : x
  2. Step 2: Convert to fraction form
    724.32/1,079.61 = 718.65/x
  3. Step 3: Cross multiply
    724.32x = 1,079.61 × 718.65
  4. Step 4: Simplify right side
    724.32x = 775,861.73
  5. Step 5: Solve for x
    x = 775,861.73/724.32
  6. Step 6: Final answer
    x = 1,071.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.