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Finding the Fourth Proportional to 1,120.80, 1,681.21 and 299.19

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Solution

The fourth proportional to 1,120.80, 1,681.21 and 299.19 is: 448.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.80 : 1,681.21 = 299.19 : x
  2. Step 2: Convert to fraction form
    1,120.80/1,681.21 = 299.19/x
  3. Step 3: Cross multiply
    1,120.80x = 1,681.21 × 299.19
  4. Step 4: Simplify right side
    1,120.80x = 503,001.22
  5. Step 5: Solve for x
    x = 503,001.22/1,120.80
  6. Step 6: Final answer
    x = 448.79

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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.