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Finding the Fourth Proportional to 943.19, 1,299.48 and 680.75

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Solution

The fourth proportional to 943.19, 1,299.48 and 680.75 is: 937.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.19 : 1,299.48 = 680.75 : x
  2. Step 2: Convert to fraction form
    943.19/1,299.48 = 680.75/x
  3. Step 3: Cross multiply
    943.19x = 1,299.48 × 680.75
  4. Step 4: Simplify right side
    943.19x = 884,621.01
  5. Step 5: Solve for x
    x = 884,621.01/943.19
  6. Step 6: Final answer
    x = 937.90

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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.