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Finding the Fourth Proportional to 489.32, 673.88 and 487.80

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Solution

The fourth proportional to 489.32, 673.88 and 487.80 is: 671.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.32 : 673.88 = 487.80 : x
  2. Step 2: Convert to fraction form
    489.32/673.88 = 487.80/x
  3. Step 3: Cross multiply
    489.32x = 673.88 × 487.80
  4. Step 4: Simplify right side
    489.32x = 328,716.23
  5. Step 5: Solve for x
    x = 328,716.23/489.32
  6. Step 6: Final answer
    x = 671.79

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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.