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Finding the Fourth Proportional to 1,287.79, 1,934.77 and 826.47

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Solution

The fourth proportional to 1,287.79, 1,934.77 and 826.47 is: 1,241.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.79 : 1,934.77 = 826.47 : x
  2. Step 2: Convert to fraction form
    1,287.79/1,934.77 = 826.47/x
  3. Step 3: Cross multiply
    1,287.79x = 1,934.77 × 826.47
  4. Step 4: Simplify right side
    1,287.79x = 1,599,027.30
  5. Step 5: Solve for x
    x = 1,599,027.30/1,287.79
  6. Step 6: Final answer
    x = 1,241.69

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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.