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Finding the Fourth Proportional to 1,247.86, 1,721.95 and 716.57

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Solution

The fourth proportional to 1,247.86, 1,721.95 and 716.57 is: 988.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.86 : 1,721.95 = 716.57 : x
  2. Step 2: Convert to fraction form
    1,247.86/1,721.95 = 716.57/x
  3. Step 3: Cross multiply
    1,247.86x = 1,721.95 × 716.57
  4. Step 4: Simplify right side
    1,247.86x = 1,233,903.45
  5. Step 5: Solve for x
    x = 1,233,903.45/1,247.86
  6. Step 6: Final answer
    x = 988.81

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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.