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Finding the Fourth Proportional to 719.29, 1,078.11 and 307.81

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Solution

The fourth proportional to 719.29, 1,078.11 and 307.81 is: 461.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.29 : 1,078.11 = 307.81 : x
  2. Step 2: Convert to fraction form
    719.29/1,078.11 = 307.81/x
  3. Step 3: Cross multiply
    719.29x = 1,078.11 × 307.81
  4. Step 4: Simplify right side
    719.29x = 331,853.04
  5. Step 5: Solve for x
    x = 331,853.04/719.29
  6. Step 6: Final answer
    x = 461.36

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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.