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Finding the Fourth Proportional to 1,823.12, 2,732.57 and 781.57

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Solution

The fourth proportional to 1,823.12, 2,732.57 and 781.57 is: 1,171.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,823.12 : 2,732.57 = 781.57 : x
  2. Step 2: Convert to fraction form
    1,823.12/2,732.57 = 781.57/x
  3. Step 3: Cross multiply
    1,823.12x = 2,732.57 × 781.57
  4. Step 4: Simplify right side
    1,823.12x = 2,135,694.73
  5. Step 5: Solve for x
    x = 2,135,694.73/1,823.12
  6. Step 6: Final answer
    x = 1,171.45

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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.