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Finding the Fourth Proportional to 1,120.89, 1,681.35 and 299.22

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Solution

The fourth proportional to 1,120.89, 1,681.35 and 299.22 is: 448.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.89 : 1,681.35 = 299.22 : x
  2. Step 2: Convert to fraction form
    1,120.89/1,681.35 = 299.22/x
  3. Step 3: Cross multiply
    1,120.89x = 1,681.35 × 299.22
  4. Step 4: Simplify right side
    1,120.89x = 503,093.55
  5. Step 5: Solve for x
    x = 503,093.55/1,120.89
  6. Step 6: Final answer
    x = 448.83

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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.