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Finding the Fourth Proportional to 869.44, 1,294.40 and 865.12

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Solution

The fourth proportional to 869.44, 1,294.40 and 865.12 is: 1,287.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.44 : 1,294.40 = 865.12 : x
  2. Step 2: Convert to fraction form
    869.44/1,294.40 = 865.12/x
  3. Step 3: Cross multiply
    869.44x = 1,294.40 × 865.12
  4. Step 4: Simplify right side
    869.44x = 1,119,811.33
  5. Step 5: Solve for x
    x = 1,119,811.33/869.44
  6. Step 6: Final answer
    x = 1,287.97

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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.