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Finding the Fourth Proportional to 719.91, 1,078.35 and 411.61

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Solution

The fourth proportional to 719.91, 1,078.35 and 411.61 is: 616.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.91 : 1,078.35 = 411.61 : x
  2. Step 2: Convert to fraction form
    719.91/1,078.35 = 411.61/x
  3. Step 3: Cross multiply
    719.91x = 1,078.35 × 411.61
  4. Step 4: Simplify right side
    719.91x = 443,859.64
  5. Step 5: Solve for x
    x = 443,859.64/719.91
  6. Step 6: Final answer
    x = 616.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.