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Finding the Fourth Proportional to 713.28, 1,069.12 and 302.76

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Solution

The fourth proportional to 713.28, 1,069.12 and 302.76 is: 453.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.28 : 1,069.12 = 302.76 : x
  2. Step 2: Convert to fraction form
    713.28/1,069.12 = 302.76/x
  3. Step 3: Cross multiply
    713.28x = 1,069.12 × 302.76
  4. Step 4: Simplify right side
    713.28x = 323,691.01
  5. Step 5: Solve for x
    x = 323,691.01/713.28
  6. Step 6: Final answer
    x = 453.81

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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.