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Finding the Fourth Proportional to 878.88, 1,317.20 and 661.84

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Solution

The fourth proportional to 878.88, 1,317.20 and 661.84 is: 991.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.88 : 1,317.20 = 661.84 : x
  2. Step 2: Convert to fraction form
    878.88/1,317.20 = 661.84/x
  3. Step 3: Cross multiply
    878.88x = 1,317.20 × 661.84
  4. Step 4: Simplify right side
    878.88x = 871,775.65
  5. Step 5: Solve for x
    x = 871,775.65/878.88
  6. Step 6: Final answer
    x = 991.92

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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.