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Finding the Fourth Proportional to 725.68, 1,088.50 and 239.12

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Solution

The fourth proportional to 725.68, 1,088.50 and 239.12 is: 358.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.68 : 1,088.50 = 239.12 : x
  2. Step 2: Convert to fraction form
    725.68/1,088.50 = 239.12/x
  3. Step 3: Cross multiply
    725.68x = 1,088.50 × 239.12
  4. Step 4: Simplify right side
    725.68x = 260,282.12
  5. Step 5: Solve for x
    x = 260,282.12/725.68
  6. Step 6: Final answer
    x = 358.67

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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.