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Finding the Fourth Proportional to 725.42, 1,085.40 and 431.84

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Solution

The fourth proportional to 725.42, 1,085.40 and 431.84 is: 646.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.42 : 1,085.40 = 431.84 : x
  2. Step 2: Convert to fraction form
    725.42/1,085.40 = 431.84/x
  3. Step 3: Cross multiply
    725.42x = 1,085.40 × 431.84
  4. Step 4: Simplify right side
    725.42x = 468,713.71
  5. Step 5: Solve for x
    x = 468,713.71/725.42
  6. Step 6: Final answer
    x = 646.13

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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.