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Finding the Fourth Proportional to 879.88, 1,320.60 and 447.28

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Solution

The fourth proportional to 879.88, 1,320.60 and 447.28 is: 671.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.88 : 1,320.60 = 447.28 : x
  2. Step 2: Convert to fraction form
    879.88/1,320.60 = 447.28/x
  3. Step 3: Cross multiply
    879.88x = 1,320.60 × 447.28
  4. Step 4: Simplify right side
    879.88x = 590,677.97
  5. Step 5: Solve for x
    x = 590,677.97/879.88
  6. Step 6: Final answer
    x = 671.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.