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Finding the Fourth Proportional to 307.57, 426.55 and 281.62

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Solution

The fourth proportional to 307.57, 426.55 and 281.62 is: 390.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.57 : 426.55 = 281.62 : x
  2. Step 2: Convert to fraction form
    307.57/426.55 = 281.62/x
  3. Step 3: Cross multiply
    307.57x = 426.55 × 281.62
  4. Step 4: Simplify right side
    307.57x = 120,123.94
  5. Step 5: Solve for x
    x = 120,123.94/307.57
  6. Step 6: Final answer
    x = 390.56

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.