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Finding the Fourth Proportional to 879.88, 1,214.17 and 486.91

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Solution

The fourth proportional to 879.88, 1,214.17 and 486.91 is: 671.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.88 : 1,214.17 = 486.91 : x
  2. Step 2: Convert to fraction form
    879.88/1,214.17 = 486.91/x
  3. Step 3: Cross multiply
    879.88x = 1,214.17 × 486.91
  4. Step 4: Simplify right side
    879.88x = 591,184.83
  5. Step 5: Solve for x
    x = 591,184.83/879.88
  6. Step 6: Final answer
    x = 671.90

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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.