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Finding the Fourth Proportional to 879.97, 1,214.43 and 487

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Solution

The fourth proportional to 879.97, 1,214.43 and 487 is: 672.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.97 : 1,214.43 = 487 : x
  2. Step 2: Convert to fraction form
    879.97/1,214.43 = 487/x
  3. Step 3: Cross multiply
    879.97x = 1,214.43 × 487
  4. Step 4: Simplify right side
    879.97x = 591,427.41
  5. Step 5: Solve for x
    x = 591,427.41/879.97
  6. Step 6: Final answer
    x = 672.10

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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.