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Finding the Fourth Proportional to 876.81, 1,315.17 and 328.96

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Solution

The fourth proportional to 876.81, 1,315.17 and 328.96 is: 493.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.81 : 1,315.17 = 328.96 : x
  2. Step 2: Convert to fraction form
    876.81/1,315.17 = 328.96/x
  3. Step 3: Cross multiply
    876.81x = 1,315.17 × 328.96
  4. Step 4: Simplify right side
    876.81x = 432,639.97
  5. Step 5: Solve for x
    x = 432,639.97/876.81
  6. Step 6: Final answer
    x = 493.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.