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Finding the Fourth Proportional to 1,474.35, 2,212.79 and 781.50

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Solution

The fourth proportional to 1,474.35, 2,212.79 and 781.50 is: 1,172.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,474.35 : 2,212.79 = 781.50 : x
  2. Step 2: Convert to fraction form
    1,474.35/2,212.79 = 781.50/x
  3. Step 3: Cross multiply
    1,474.35x = 2,212.79 × 781.50
  4. Step 4: Simplify right side
    1,474.35x = 1,729,291.48
  5. Step 5: Solve for x
    x = 1,729,291.48/1,474.35
  6. Step 6: Final answer
    x = 1,172.92

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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.