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Finding the Fourth Proportional to 1,121.17, 1,681.74 and 299.42

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Solution

The fourth proportional to 1,121.17, 1,681.74 and 299.42 is: 449.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.17 : 1,681.74 = 299.42 : x
  2. Step 2: Convert to fraction form
    1,121.17/1,681.74 = 299.42/x
  3. Step 3: Cross multiply
    1,121.17x = 1,681.74 × 299.42
  4. Step 4: Simplify right side
    1,121.17x = 503,546.59
  5. Step 5: Solve for x
    x = 503,546.59/1,121.17
  6. Step 6: Final answer
    x = 449.13

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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.