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Finding the Fourth Proportional to 876.53, 1,315.17 and 328.65

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Solution

The fourth proportional to 876.53, 1,315.17 and 328.65 is: 493.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.53 : 1,315.17 = 328.65 : x
  2. Step 2: Convert to fraction form
    876.53/1,315.17 = 328.65/x
  3. Step 3: Cross multiply
    876.53x = 1,315.17 × 328.65
  4. Step 4: Simplify right side
    876.53x = 432,230.62
  5. Step 5: Solve for x
    x = 432,230.62/876.53
  6. Step 6: Final answer
    x = 493.12

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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.