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Finding the Fourth Proportional to 725.81, 1,087.80 and 433.53

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Solution

The fourth proportional to 725.81, 1,087.80 and 433.53 is: 649.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.81 : 1,087.80 = 433.53 : x
  2. Step 2: Convert to fraction form
    725.81/1,087.80 = 433.53/x
  3. Step 3: Cross multiply
    725.81x = 1,087.80 × 433.53
  4. Step 4: Simplify right side
    725.81x = 471,592.91
  5. Step 5: Solve for x
    x = 471,592.91/725.81
  6. Step 6: Final answer
    x = 649.75

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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.