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Finding the Fourth Proportional to 1,287.99, 1,931.04 and 826.29

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Solution

The fourth proportional to 1,287.99, 1,931.04 and 826.29 is: 1,238.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.99 : 1,931.04 = 826.29 : x
  2. Step 2: Convert to fraction form
    1,287.99/1,931.04 = 826.29/x
  3. Step 3: Cross multiply
    1,287.99x = 1,931.04 × 826.29
  4. Step 4: Simplify right side
    1,287.99x = 1,595,599.04
  5. Step 5: Solve for x
    x = 1,595,599.04/1,287.99
  6. Step 6: Final answer
    x = 1,238.83

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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.