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Finding the Fourth Proportional to 489.19, 675.23 and 331.70

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Solution

The fourth proportional to 489.19, 675.23 and 331.70 is: 457.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.19 : 675.23 = 331.70 : x
  2. Step 2: Convert to fraction form
    489.19/675.23 = 331.70/x
  3. Step 3: Cross multiply
    489.19x = 675.23 × 331.70
  4. Step 4: Simplify right side
    489.19x = 223,973.79
  5. Step 5: Solve for x
    x = 223,973.79/489.19
  6. Step 6: Final answer
    x = 457.85

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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.