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Finding the Fourth Proportional to 2,013.66, 3,020.49 and 781.25

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Solution

The fourth proportional to 2,013.66, 3,020.49 and 781.25 is: 1,171.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,013.66 : 3,020.49 = 781.25 : x
  2. Step 2: Convert to fraction form
    2,013.66/3,020.49 = 781.25/x
  3. Step 3: Cross multiply
    2,013.66x = 3,020.49 × 781.25
  4. Step 4: Simplify right side
    2,013.66x = 2,359,742.71
  5. Step 5: Solve for x
    x = 2,359,742.71/2,013.66
  6. Step 6: Final answer
    x = 1,171.87

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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.