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Finding the Fourth Proportional to 1,513.28, 2,271.12 and 647.72

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Solution

The fourth proportional to 1,513.28, 2,271.12 and 647.72 is: 972.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,513.28 : 2,271.12 = 647.72 : x
  2. Step 2: Convert to fraction form
    1,513.28/2,271.12 = 647.72/x
  3. Step 3: Cross multiply
    1,513.28x = 2,271.12 × 647.72
  4. Step 4: Simplify right side
    1,513.28x = 1,471,049.85
  5. Step 5: Solve for x
    x = 1,471,049.85/1,513.28
  6. Step 6: Final answer
    x = 972.09

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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.