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Finding the Fourth Proportional to 725.67, 1,085.77 and 432.09

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Solution

The fourth proportional to 725.67, 1,085.77 and 432.09 is: 646.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.67 : 1,085.77 = 432.09 : x
  2. Step 2: Convert to fraction form
    725.67/1,085.77 = 432.09/x
  3. Step 3: Cross multiply
    725.67x = 1,085.77 × 432.09
  4. Step 4: Simplify right side
    725.67x = 469,150.36
  5. Step 5: Solve for x
    x = 469,150.36/725.67
  6. Step 6: Final answer
    x = 646.51

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1.5x scale

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.