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Finding the Fourth Proportional to 942, 1,299.96 and 721.20

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Solution

The fourth proportional to 942, 1,299.96 and 721.20 is: 995.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    942 : 1,299.96 = 721.20 : x
  2. Step 2: Convert to fraction form
    942/1,299.96 = 721.20/x
  3. Step 3: Cross multiply
    942x = 1,299.96 × 721.20
  4. Step 4: Simplify right side
    942x = 937,531.15
  5. Step 5: Solve for x
    x = 937,531.15/942
  6. Step 6: Final answer
    x = 995.26

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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.