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Finding the Fourth Proportional to 2,447.57, 3,671.17 and 781.64

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Solution

The fourth proportional to 2,447.57, 3,671.17 and 781.64 is: 1,172.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,447.57 : 3,671.17 = 781.64 : x
  2. Step 2: Convert to fraction form
    2,447.57/3,671.17 = 781.64/x
  3. Step 3: Cross multiply
    2,447.57x = 3,671.17 × 781.64
  4. Step 4: Simplify right side
    2,447.57x = 2,869,533.32
  5. Step 5: Solve for x
    x = 2,869,533.32/2,447.57
  6. Step 6: Final answer
    x = 1,172.40

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1.5x scale

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.