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Finding the Fourth Proportional to 697.28, 961.48 and 487.68

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Solution

The fourth proportional to 697.28, 961.48 and 487.68 is: 672.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.28 : 961.48 = 487.68 : x
  2. Step 2: Convert to fraction form
    697.28/961.48 = 487.68/x
  3. Step 3: Cross multiply
    697.28x = 961.48 × 487.68
  4. Step 4: Simplify right side
    697.28x = 468,894.57
  5. Step 5: Solve for x
    x = 468,894.57/697.28
  6. Step 6: Final answer
    x = 672.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.