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Finding the Fourth Proportional to 1,512.10, 2,268.12 and 781.87

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Solution

The fourth proportional to 1,512.10, 2,268.12 and 781.87 is: 1,172.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,512.10 : 2,268.12 = 781.87 : x
  2. Step 2: Convert to fraction form
    1,512.10/2,268.12 = 781.87/x
  3. Step 3: Cross multiply
    1,512.10x = 2,268.12 × 781.87
  4. Step 4: Simplify right side
    1,512.10x = 1,773,374.98
  5. Step 5: Solve for x
    x = 1,773,374.98/1,512.10
  6. Step 6: Final answer
    x = 1,172.79

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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.