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Finding the Fourth Proportional to 879.85, 1,214.19 and 486.87

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Solution

The fourth proportional to 879.85, 1,214.19 and 486.87 is: 671.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.85 : 1,214.19 = 486.87 : x
  2. Step 2: Convert to fraction form
    879.85/1,214.19 = 486.87/x
  3. Step 3: Cross multiply
    879.85x = 1,214.19 × 486.87
  4. Step 4: Simplify right side
    879.85x = 591,152.69
  5. Step 5: Solve for x
    x = 591,152.69/879.85
  6. Step 6: Final answer
    x = 671.88

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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.