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Finding the Fourth Proportional to 1,513.92, 2,271.42 and 865.92

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Solution

The fourth proportional to 1,513.92, 2,271.42 and 865.92 is: 1,299.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,513.92 : 2,271.42 = 865.92 : x
  2. Step 2: Convert to fraction form
    1,513.92/2,271.42 = 865.92/x
  3. Step 3: Cross multiply
    1,513.92x = 2,271.42 × 865.92
  4. Step 4: Simplify right side
    1,513.92x = 1,966,868.01
  5. Step 5: Solve for x
    x = 1,966,868.01/1,513.92
  6. Step 6: Final answer
    x = 1,299.19

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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.