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Finding the Fourth Proportional to 801.12, 1,105.65 and 580.80

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Solution

The fourth proportional to 801.12, 1,105.65 and 580.80 is: 801.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.12 : 1,105.65 = 580.80 : x
  2. Step 2: Convert to fraction form
    801.12/1,105.65 = 580.80/x
  3. Step 3: Cross multiply
    801.12x = 1,105.65 × 580.80
  4. Step 4: Simplify right side
    801.12x = 642,161.52
  5. Step 5: Solve for x
    x = 642,161.52/801.12
  6. Step 6: Final answer
    x = 801.58

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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.