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Finding the Fourth Proportional to 879.92, 1,214.21 and 486.92

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Solution

The fourth proportional to 879.92, 1,214.21 and 486.92 is: 671.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.92 : 1,214.21 = 486.92 : x
  2. Step 2: Convert to fraction form
    879.92/1,214.21 = 486.92/x
  3. Step 3: Cross multiply
    879.92x = 1,214.21 × 486.92
  4. Step 4: Simplify right side
    879.92x = 591,214.63
  5. Step 5: Solve for x
    x = 591,214.63/879.92
  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.