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Finding the Fourth Proportional to 1,368.11, 2,050.16 and 781.29

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Solution

The fourth proportional to 1,368.11, 2,050.16 and 781.29 is: 1,170.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.11 : 2,050.16 = 781.29 : x
  2. Step 2: Convert to fraction form
    1,368.11/2,050.16 = 781.29/x
  3. Step 3: Cross multiply
    1,368.11x = 2,050.16 × 781.29
  4. Step 4: Simplify right side
    1,368.11x = 1,601,765.60
  5. Step 5: Solve for x
    x = 1,601,765.60/1,368.11
  6. Step 6: Final answer
    x = 1,170.79

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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.