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Finding the Fourth Proportional to 1,236.51, 1,854.81 and 991.89

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Solution

The fourth proportional to 1,236.51, 1,854.81 and 991.89 is: 1,487.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.51 : 1,854.81 = 991.89 : x
  2. Step 2: Convert to fraction form
    1,236.51/1,854.81 = 991.89/x
  3. Step 3: Cross multiply
    1,236.51x = 1,854.81 × 991.89
  4. Step 4: Simplify right side
    1,236.51x = 1,839,767.49
  5. Step 5: Solve for x
    x = 1,839,767.49/1,236.51
  6. Step 6: Final answer
    x = 1,487.87

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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.