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Finding the Fourth Proportional to 1,028.66, 1,542.60 and 638.08

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Solution

The fourth proportional to 1,028.66, 1,542.60 and 638.08 is: 956.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.66 : 1,542.60 = 638.08 : x
  2. Step 2: Convert to fraction form
    1,028.66/1,542.60 = 638.08/x
  3. Step 3: Cross multiply
    1,028.66x = 1,542.60 × 638.08
  4. Step 4: Simplify right side
    1,028.66x = 984,298.35
  5. Step 5: Solve for x
    x = 984,298.35/1,028.66
  6. Step 6: Final answer
    x = 956.88

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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.