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Finding the Fourth Proportional to 725.60, 1,085.76 and 401.28

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Solution

The fourth proportional to 725.60, 1,085.76 and 401.28 is: 600.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.60 : 1,085.76 = 401.28 : x
  2. Step 2: Convert to fraction form
    725.60/1,085.76 = 401.28/x
  3. Step 3: Cross multiply
    725.60x = 1,085.76 × 401.28
  4. Step 4: Simplify right side
    725.60x = 435,693.77
  5. Step 5: Solve for x
    x = 435,693.77/725.60
  6. Step 6: Final answer
    x = 600.46

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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.