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Finding the Fourth Proportional to 879.45, 1,320.17 and 555

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Solution

The fourth proportional to 879.45, 1,320.17 and 555 is: 833.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.45 : 1,320.17 = 555 : x
  2. Step 2: Convert to fraction form
    879.45/1,320.17 = 555/x
  3. Step 3: Cross multiply
    879.45x = 1,320.17 × 555
  4. Step 4: Simplify right side
    879.45x = 732,691.58
  5. Step 5: Solve for x
    x = 732,691.58/879.45
  6. Step 6: Final answer
    x = 833.12

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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.