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Finding the Fourth Proportional to 1,454.75, 2,182.55 and 428.75

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Solution

The fourth proportional to 1,454.75, 2,182.55 and 428.75 is: 643.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,454.75 : 2,182.55 = 428.75 : x
  2. Step 2: Convert to fraction form
    1,454.75/2,182.55 = 428.75/x
  3. Step 3: Cross multiply
    1,454.75x = 2,182.55 × 428.75
  4. Step 4: Simplify right side
    1,454.75x = 935,766.17
  5. Step 5: Solve for x
    x = 935,766.17/1,454.75
  6. Step 6: Final answer
    x = 643.25

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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.