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Finding the Fourth Proportional to 1,287.99, 1,782.11 and 1,122.55

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Solution

The fourth proportional to 1,287.99, 1,782.11 and 1,122.55 is: 1,553.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.99 : 1,782.11 = 1,122.55 : x
  2. Step 2: Convert to fraction form
    1,287.99/1,782.11 = 1,122.55/x
  3. Step 3: Cross multiply
    1,287.99x = 1,782.11 × 1,122.55
  4. Step 4: Simplify right side
    1,287.99x = 2,000,505.93
  5. Step 5: Solve for x
    x = 2,000,505.93/1,287.99
  6. Step 6: Final answer
    x = 1,553.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.