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Finding the Fourth Proportional to 1,049.21, 1,572.78 and 433.43

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Solution

The fourth proportional to 1,049.21, 1,572.78 and 433.43 is: 649.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.21 : 1,572.78 = 433.43 : x
  2. Step 2: Convert to fraction form
    1,049.21/1,572.78 = 433.43/x
  3. Step 3: Cross multiply
    1,049.21x = 1,572.78 × 433.43
  4. Step 4: Simplify right side
    1,049.21x = 681,690.04
  5. Step 5: Solve for x
    x = 681,690.04/1,049.21
  6. Step 6: Final answer
    x = 649.72

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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.