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Finding the Fourth Proportional to 943.20, 1,301.13 and 680.76

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Solution

The fourth proportional to 943.20, 1,301.13 and 680.76 is: 939.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.20 : 1,301.13 = 680.76 : x
  2. Step 2: Convert to fraction form
    943.20/1,301.13 = 680.76/x
  3. Step 3: Cross multiply
    943.20x = 1,301.13 × 680.76
  4. Step 4: Simplify right side
    943.20x = 885,757.26
  5. Step 5: Solve for x
    x = 885,757.26/943.20
  6. Step 6: Final answer
    x = 939.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.