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Finding the Fourth Proportional to 697.21, 961.54 and 487.28

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Solution

The fourth proportional to 697.21, 961.54 and 487.28 is: 672.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.21 : 961.54 = 487.28 : x
  2. Step 2: Convert to fraction form
    697.21/961.54 = 487.28/x
  3. Step 3: Cross multiply
    697.21x = 961.54 × 487.28
  4. Step 4: Simplify right side
    697.21x = 468,540.40
  5. Step 5: Solve for x
    x = 468,540.40/697.21
  6. Step 6: Final answer
    x = 672.02

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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.