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Finding the Fourth Proportional to 865.80, 1,291.10 and 798.48

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Solution

The fourth proportional to 865.80, 1,291.10 and 798.48 is: 1,190.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.80 : 1,291.10 = 798.48 : x
  2. Step 2: Convert to fraction form
    865.80/1,291.10 = 798.48/x
  3. Step 3: Cross multiply
    865.80x = 1,291.10 × 798.48
  4. Step 4: Simplify right side
    865.80x = 1,030,913.54
  5. Step 5: Solve for x
    x = 1,030,913.54/865.80
  6. Step 6: Final answer
    x = 1,190.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.