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Finding the Fourth Proportional to 1,121.30, 1,681.82 and 299.64

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Solution

The fourth proportional to 1,121.30, 1,681.82 and 299.64 is: 449.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.30 : 1,681.82 = 299.64 : x
  2. Step 2: Convert to fraction form
    1,121.30/1,681.82 = 299.64/x
  3. Step 3: Cross multiply
    1,121.30x = 1,681.82 × 299.64
  4. Step 4: Simplify right side
    1,121.30x = 503,937.02
  5. Step 5: Solve for x
    x = 503,937.02/1,121.30
  6. Step 6: Final answer
    x = 449.42

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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.