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Finding the Fourth Proportional to 725.64, 1,088.08 and 238.40

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Solution

The fourth proportional to 725.64, 1,088.08 and 238.40 is: 357.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.64 : 1,088.08 = 238.40 : x
  2. Step 2: Convert to fraction form
    725.64/1,088.08 = 238.40/x
  3. Step 3: Cross multiply
    725.64x = 1,088.08 × 238.40
  4. Step 4: Simplify right side
    725.64x = 259,398.27
  5. Step 5: Solve for x
    x = 259,398.27/725.64
  6. Step 6: Final answer
    x = 357.48

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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.