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Finding the Fourth Proportional to 719.51, 1,078.19 and 411.46

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Solution

The fourth proportional to 719.51, 1,078.19 and 411.46 is: 616.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.51 : 1,078.19 = 411.46 : x
  2. Step 2: Convert to fraction form
    719.51/1,078.19 = 411.46/x
  3. Step 3: Cross multiply
    719.51x = 1,078.19 × 411.46
  4. Step 4: Simplify right side
    719.51x = 443,632.06
  5. Step 5: Solve for x
    x = 443,632.06/719.51
  6. Step 6: Final answer
    x = 616.58

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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.