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Finding the Fourth Proportional to 1,028.58, 1,543.08 and 379.20

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Solution

The fourth proportional to 1,028.58, 1,543.08 and 379.20 is: 568.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.58 : 1,543.08 = 379.20 : x
  2. Step 2: Convert to fraction form
    1,028.58/1,543.08 = 379.20/x
  3. Step 3: Cross multiply
    1,028.58x = 1,543.08 × 379.20
  4. Step 4: Simplify right side
    1,028.58x = 585,135.94
  5. Step 5: Solve for x
    x = 585,135.94/1,028.58
  6. Step 6: Final answer
    x = 568.88

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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.