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Finding the Fourth Proportional to 759.28, 1,047.78 and 538.60

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Solution

The fourth proportional to 759.28, 1,047.78 and 538.60 is: 743.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.28 : 1,047.78 = 538.60 : x
  2. Step 2: Convert to fraction form
    759.28/1,047.78 = 538.60/x
  3. Step 3: Cross multiply
    759.28x = 1,047.78 × 538.60
  4. Step 4: Simplify right side
    759.28x = 564,334.31
  5. Step 5: Solve for x
    x = 564,334.31/759.28
  6. Step 6: Final answer
    x = 743.25

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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.