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Finding the Fourth Proportional to 877.96, 1,315.92 and 329.79

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Solution

The fourth proportional to 877.96, 1,315.92 and 329.79 is: 494.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.96 : 1,315.92 = 329.79 : x
  2. Step 2: Convert to fraction form
    877.96/1,315.92 = 329.79/x
  3. Step 3: Cross multiply
    877.96x = 1,315.92 × 329.79
  4. Step 4: Simplify right side
    877.96x = 433,978.49
  5. Step 5: Solve for x
    x = 433,978.49/877.96
  6. Step 6: Final answer
    x = 494.30

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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.