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Finding the Fourth Proportional to 1,308.47, 1,805.78 and 749.13

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Solution

The fourth proportional to 1,308.47, 1,805.78 and 749.13 is: 1,033.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.47 : 1,805.78 = 749.13 : x
  2. Step 2: Convert to fraction form
    1,308.47/1,805.78 = 749.13/x
  3. Step 3: Cross multiply
    1,308.47x = 1,805.78 × 749.13
  4. Step 4: Simplify right side
    1,308.47x = 1,352,760.23
  5. Step 5: Solve for x
    x = 1,352,760.23/1,308.47
  6. Step 6: Final answer
    x = 1,033.85

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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.