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Finding the Fourth Proportional to 743.76, 1,027.67 and 717.48

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Solution

The fourth proportional to 743.76, 1,027.67 and 717.48 is: 991.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.76 : 1,027.67 = 717.48 : x
  2. Step 2: Convert to fraction form
    743.76/1,027.67 = 717.48/x
  3. Step 3: Cross multiply
    743.76x = 1,027.67 × 717.48
  4. Step 4: Simplify right side
    743.76x = 737,332.67
  5. Step 5: Solve for x
    x = 737,332.67/743.76
  6. Step 6: Final answer
    x = 991.36

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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.