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Finding the Fourth Proportional to 1,120.82, 1,681.38 and 299.12

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Solution

The fourth proportional to 1,120.82, 1,681.38 and 299.12 is: 448.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.82 : 1,681.38 = 299.12 : x
  2. Step 2: Convert to fraction form
    1,120.82/1,681.38 = 299.12/x
  3. Step 3: Cross multiply
    1,120.82x = 1,681.38 × 299.12
  4. Step 4: Simplify right side
    1,120.82x = 502,925.98
  5. Step 5: Solve for x
    x = 502,925.98/1,120.82
  6. Step 6: Final answer
    x = 448.71

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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.