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Finding the Fourth Proportional to 781.40, 1,171.49 and 371.03

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Solution

The fourth proportional to 781.40, 1,171.49 and 371.03 is: 556.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.40 : 1,171.49 = 371.03 : x
  2. Step 2: Convert to fraction form
    781.40/1,171.49 = 371.03/x
  3. Step 3: Cross multiply
    781.40x = 1,171.49 × 371.03
  4. Step 4: Simplify right side
    781.40x = 434,657.86
  5. Step 5: Solve for x
    x = 434,657.86/781.40
  6. Step 6: Final answer
    x = 556.26

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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.