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Finding the Fourth Proportional to 876.77, 1,315.15 and 329.21

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Solution

The fourth proportional to 876.77, 1,315.15 and 329.21 is: 493.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.77 : 1,315.15 = 329.21 : x
  2. Step 2: Convert to fraction form
    876.77/1,315.15 = 329.21/x
  3. Step 3: Cross multiply
    876.77x = 1,315.15 × 329.21
  4. Step 4: Simplify right side
    876.77x = 432,960.53
  5. Step 5: Solve for x
    x = 432,960.53/876.77
  6. Step 6: Final answer
    x = 493.81

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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.