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Finding the Fourth Proportional to 697.28, 1,045.12 and 453.76

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Solution

The fourth proportional to 697.28, 1,045.12 and 453.76 is: 680.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.28 : 1,045.12 = 453.76 : x
  2. Step 2: Convert to fraction form
    697.28/1,045.12 = 453.76/x
  3. Step 3: Cross multiply
    697.28x = 1,045.12 × 453.76
  4. Step 4: Simplify right side
    697.28x = 474,233.65
  5. Step 5: Solve for x
    x = 474,233.65/697.28
  6. Step 6: Final answer
    x = 680.12

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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.