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Finding the Fourth Proportional to 1,247.82, 1,724.13 and 987.81

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Solution

The fourth proportional to 1,247.82, 1,724.13 and 987.81 is: 1,364.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.82 : 1,724.13 = 987.81 : x
  2. Step 2: Convert to fraction form
    1,247.82/1,724.13 = 987.81/x
  3. Step 3: Cross multiply
    1,247.82x = 1,724.13 × 987.81
  4. Step 4: Simplify right side
    1,247.82x = 1,703,112.86
  5. Step 5: Solve for x
    x = 1,703,112.86/1,247.82
  6. Step 6: Final answer
    x = 1,364.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.