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Finding the Fourth Proportional to 1,287.42, 1,934.21 and 826.10

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Solution

The fourth proportional to 1,287.42, 1,934.21 and 826.10 is: 1,241.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.42 : 1,934.21 = 826.10 : x
  2. Step 2: Convert to fraction form
    1,287.42/1,934.21 = 826.10/x
  3. Step 3: Cross multiply
    1,287.42x = 1,934.21 × 826.10
  4. Step 4: Simplify right side
    1,287.42x = 1,597,837.08
  5. Step 5: Solve for x
    x = 1,597,837.08/1,287.42
  6. Step 6: Final answer
    x = 1,241.12

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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.