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Finding the Fourth Proportional to 942.56, 1,299.84 and 721.52

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Solution

The fourth proportional to 942.56, 1,299.84 and 721.52 is: 995.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.56 : 1,299.84 = 721.52 : x
  2. Step 2: Convert to fraction form
    942.56/1,299.84 = 721.52/x
  3. Step 3: Cross multiply
    942.56x = 1,299.84 × 721.52
  4. Step 4: Simplify right side
    942.56x = 937,860.56
  5. Step 5: Solve for x
    x = 937,860.56/942.56
  6. Step 6: Final answer
    x = 995.01

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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.