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Finding the Fourth Proportional to 870.28, 1,299.08 and 755.52

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Solution

The fourth proportional to 870.28, 1,299.08 and 755.52 is: 1,127.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.28 : 1,299.08 = 755.52 : x
  2. Step 2: Convert to fraction form
    870.28/1,299.08 = 755.52/x
  3. Step 3: Cross multiply
    870.28x = 1,299.08 × 755.52
  4. Step 4: Simplify right side
    870.28x = 981,480.92
  5. Step 5: Solve for x
    x = 981,480.92/870.28
  6. Step 6: Final answer
    x = 1,127.78

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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.