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Finding the Fourth Proportional to 1,028.80, 1,543.20 and 451.52

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Solution

The fourth proportional to 1,028.80, 1,543.20 and 451.52 is: 677.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.80 : 1,543.20 = 451.52 : x
  2. Step 2: Convert to fraction form
    1,028.80/1,543.20 = 451.52/x
  3. Step 3: Cross multiply
    1,028.80x = 1,543.20 × 451.52
  4. Step 4: Simplify right side
    1,028.80x = 696,785.66
  5. Step 5: Solve for x
    x = 696,785.66/1,028.80
  6. Step 6: Final answer
    x = 677.28

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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.