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Finding the Fourth Proportional to 876.71, 1,315.22 and 328.88

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Solution

The fourth proportional to 876.71, 1,315.22 and 328.88 is: 493.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.71 : 1,315.22 = 328.88 : x
  2. Step 2: Convert to fraction form
    876.71/1,315.22 = 328.88/x
  3. Step 3: Cross multiply
    876.71x = 1,315.22 × 328.88
  4. Step 4: Simplify right side
    876.71x = 432,551.20
  5. Step 5: Solve for x
    x = 432,551.20/876.71
  6. Step 6: Final answer
    x = 493.38

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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.