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Finding the Fourth Proportional to 879.97, 1,320.96 and 515.02

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Solution

The fourth proportional to 879.97, 1,320.96 and 515.02 is: 773.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.97 : 1,320.96 = 515.02 : x
  2. Step 2: Convert to fraction form
    879.97/1,320.96 = 515.02/x
  3. Step 3: Cross multiply
    879.97x = 1,320.96 × 515.02
  4. Step 4: Simplify right side
    879.97x = 680,320.82
  5. Step 5: Solve for x
    x = 680,320.82/879.97
  6. Step 6: Final answer
    x = 773.12

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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.