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Finding the Fourth Proportional to 879.24, 1,212.90 and 542.88

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Solution

The fourth proportional to 879.24, 1,212.90 and 542.88 is: 748.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.24 : 1,212.90 = 542.88 : x
  2. Step 2: Convert to fraction form
    879.24/1,212.90 = 542.88/x
  3. Step 3: Cross multiply
    879.24x = 1,212.90 × 542.88
  4. Step 4: Simplify right side
    879.24x = 658,459.15
  5. Step 5: Solve for x
    x = 658,459.15/879.24
  6. Step 6: Final answer
    x = 748.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.