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Finding the Fourth Proportional to 1,069.28, 1,475.56 and 627.20

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Solution

The fourth proportional to 1,069.28, 1,475.56 and 627.20 is: 865.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.28 : 1,475.56 = 627.20 : x
  2. Step 2: Convert to fraction form
    1,069.28/1,475.56 = 627.20/x
  3. Step 3: Cross multiply
    1,069.28x = 1,475.56 × 627.20
  4. Step 4: Simplify right side
    1,069.28x = 925,471.23
  5. Step 5: Solve for x
    x = 925,471.23/1,069.28
  6. Step 6: Final answer
    x = 865.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.