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Finding the Fourth Proportional to 1,243.92, 1,717.20 and 719.76

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Solution

The fourth proportional to 1,243.92, 1,717.20 and 719.76 is: 993.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.92 : 1,717.20 = 719.76 : x
  2. Step 2: Convert to fraction form
    1,243.92/1,717.20 = 719.76/x
  3. Step 3: Cross multiply
    1,243.92x = 1,717.20 × 719.76
  4. Step 4: Simplify right side
    1,243.92x = 1,235,971.87
  5. Step 5: Solve for x
    x = 1,235,971.87/1,243.92
  6. Step 6: Final answer
    x = 993.61

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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.