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Finding the Fourth Proportional to 937.56, 1,405.92 and 721.28

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Solution

The fourth proportional to 937.56, 1,405.92 and 721.28 is: 1,081.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.56 : 1,405.92 = 721.28 : x
  2. Step 2: Convert to fraction form
    937.56/1,405.92 = 721.28/x
  3. Step 3: Cross multiply
    937.56x = 1,405.92 × 721.28
  4. Step 4: Simplify right side
    937.56x = 1,014,061.98
  5. Step 5: Solve for x
    x = 1,014,061.98/937.56
  6. Step 6: Final answer
    x = 1,081.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.