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Finding the Fourth Proportional to 1,275.12, 1,908.69 and 813.42

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Solution

The fourth proportional to 1,275.12, 1,908.69 and 813.42 is: 1,217.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.12 : 1,908.69 = 813.42 : x
  2. Step 2: Convert to fraction form
    1,275.12/1,908.69 = 813.42/x
  3. Step 3: Cross multiply
    1,275.12x = 1,908.69 × 813.42
  4. Step 4: Simplify right side
    1,275.12x = 1,552,566.62
  5. Step 5: Solve for x
    x = 1,552,566.62/1,275.12
  6. Step 6: Final answer
    x = 1,217.58

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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.