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Finding the Fourth Proportional to 489, 674.88 and 372.36

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Solution

The fourth proportional to 489, 674.88 and 372.36 is: 513.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 674.88 = 372.36 : x
  2. Step 2: Convert to fraction form
    489/674.88 = 372.36/x
  3. Step 3: Cross multiply
    489x = 674.88 × 372.36
  4. Step 4: Simplify right side
    489x = 251,298.32
  5. Step 5: Solve for x
    x = 251,298.32/489
  6. Step 6: Final answer
    x = 513.90

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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.