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Finding the Fourth Proportional to 1,247.67, 1,721.59 and 716.58

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Solution

The fourth proportional to 1,247.67, 1,721.59 and 716.58 is: 988.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.67 : 1,721.59 = 716.58 : x
  2. Step 2: Convert to fraction form
    1,247.67/1,721.59 = 716.58/x
  3. Step 3: Cross multiply
    1,247.67x = 1,721.59 × 716.58
  4. Step 4: Simplify right side
    1,247.67x = 1,233,655.17
  5. Step 5: Solve for x
    x = 1,233,655.17/1,247.67
  6. Step 6: Final answer
    x = 988.77

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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.