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Finding the Fourth Proportional to 719.05, 1,078.61 and 307.90

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Solution

The fourth proportional to 719.05, 1,078.61 and 307.90 is: 461.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.05 : 1,078.61 = 307.90 : x
  2. Step 2: Convert to fraction form
    719.05/1,078.61 = 307.90/x
  3. Step 3: Cross multiply
    719.05x = 1,078.61 × 307.90
  4. Step 4: Simplify right side
    719.05x = 332,097.09
  5. Step 5: Solve for x
    x = 332,097.09/719.05
  6. Step 6: Final answer
    x = 461.86

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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.