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Finding the Fourth Proportional to 489.59, 675.56 and 315.17

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Solution

The fourth proportional to 489.59, 675.56 and 315.17 is: 434.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.59 : 675.56 = 315.17 : x
  2. Step 2: Convert to fraction form
    489.59/675.56 = 315.17/x
  3. Step 3: Cross multiply
    489.59x = 675.56 × 315.17
  4. Step 4: Simplify right side
    489.59x = 212,911.29
  5. Step 5: Solve for x
    x = 212,911.29/489.59
  6. Step 6: Final answer
    x = 434.88

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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.