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Finding the Fourth Proportional to 1,253.16, 1,878.36 and 791.28

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Solution

The fourth proportional to 1,253.16, 1,878.36 and 791.28 is: 1,186.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.16 : 1,878.36 = 791.28 : x
  2. Step 2: Convert to fraction form
    1,253.16/1,878.36 = 791.28/x
  3. Step 3: Cross multiply
    1,253.16x = 1,878.36 × 791.28
  4. Step 4: Simplify right side
    1,253.16x = 1,486,308.70
  5. Step 5: Solve for x
    x = 1,486,308.70/1,253.16
  6. Step 6: Final answer
    x = 1,186.05

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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.