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Finding the Fourth Proportional to 1,293.52, 1,939.35 and 772.28

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Solution

The fourth proportional to 1,293.52, 1,939.35 and 772.28 is: 1,157.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.52 : 1,939.35 = 772.28 : x
  2. Step 2: Convert to fraction form
    1,293.52/1,939.35 = 772.28/x
  3. Step 3: Cross multiply
    1,293.52x = 1,939.35 × 772.28
  4. Step 4: Simplify right side
    1,293.52x = 1,497,721.22
  5. Step 5: Solve for x
    x = 1,497,721.22/1,293.52
  6. Step 6: Final answer
    x = 1,157.86

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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.