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Finding the Fourth Proportional to 913.96, 1,370.46 and 721

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Solution

The fourth proportional to 913.96, 1,370.46 and 721 is: 1,081.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.96 : 1,370.46 = 721 : x
  2. Step 2: Convert to fraction form
    913.96/1,370.46 = 721/x
  3. Step 3: Cross multiply
    913.96x = 1,370.46 × 721
  4. Step 4: Simplify right side
    913.96x = 988,101.66
  5. Step 5: Solve for x
    x = 988,101.66/913.96
  6. Step 6: Final answer
    x = 1,081.12

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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.