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Finding the Fourth Proportional to 1,271.46, 1,907.10 and 721.92

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Solution

The fourth proportional to 1,271.46, 1,907.10 and 721.92 is: 1,082.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.46 : 1,907.10 = 721.92 : x
  2. Step 2: Convert to fraction form
    1,271.46/1,907.10 = 721.92/x
  3. Step 3: Cross multiply
    1,271.46x = 1,907.10 × 721.92
  4. Step 4: Simplify right side
    1,271.46x = 1,376,773.63
  5. Step 5: Solve for x
    x = 1,376,773.63/1,271.46
  6. Step 6: Final answer
    x = 1,082.83

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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.