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Finding the Fourth Proportional to 1,474.94, 2,211.20 and 781.19

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Solution

The fourth proportional to 1,474.94, 2,211.20 and 781.19 is: 1,171.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,474.94 : 2,211.20 = 781.19 : x
  2. Step 2: Convert to fraction form
    1,474.94/2,211.20 = 781.19/x
  3. Step 3: Cross multiply
    1,474.94x = 2,211.20 × 781.19
  4. Step 4: Simplify right side
    1,474.94x = 1,727,363.42
  5. Step 5: Solve for x
    x = 1,727,363.42/1,474.94
  6. Step 6: Final answer
    x = 1,171.14

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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.