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Finding the Fourth Proportional to 1,247.58, 1,721.93 and 716.56

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Solution

The fourth proportional to 1,247.58, 1,721.93 and 716.56 is: 989.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.58 : 1,721.93 = 716.56 : x
  2. Step 2: Convert to fraction form
    1,247.58/1,721.93 = 716.56/x
  3. Step 3: Cross multiply
    1,247.58x = 1,721.93 × 716.56
  4. Step 4: Simplify right side
    1,247.58x = 1,233,858.27
  5. Step 5: Solve for x
    x = 1,233,858.27/1,247.58
  6. Step 6: Final answer
    x = 989.00

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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.