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Finding the Fourth Proportional to 943.60, 1,299.48 and 681.20

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Solution

The fourth proportional to 943.60, 1,299.48 and 681.20 is: 938.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.60 : 1,299.48 = 681.20 : x
  2. Step 2: Convert to fraction form
    943.60/1,299.48 = 681.20/x
  3. Step 3: Cross multiply
    943.60x = 1,299.48 × 681.20
  4. Step 4: Simplify right side
    943.60x = 885,205.78
  5. Step 5: Solve for x
    x = 885,205.78/943.60
  6. Step 6: Final answer
    x = 938.12

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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.