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Finding the Fourth Proportional to 2,447.45, 3,671.28 and 781.74

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Solution

The fourth proportional to 2,447.45, 3,671.28 and 781.74 is: 1,172.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,447.45 : 3,671.28 = 781.74 : x
  2. Step 2: Convert to fraction form
    2,447.45/3,671.28 = 781.74/x
  3. Step 3: Cross multiply
    2,447.45x = 3,671.28 × 781.74
  4. Step 4: Simplify right side
    2,447.45x = 2,869,986.43
  5. Step 5: Solve for x
    x = 2,869,986.43/2,447.45
  6. Step 6: Final answer
    x = 1,172.65

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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.