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Finding the Fourth Proportional to 307.38, 424.44 and 257.56

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Solution

The fourth proportional to 307.38, 424.44 and 257.56 is: 355.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.38 : 424.44 = 257.56 : x
  2. Step 2: Convert to fraction form
    307.38/424.44 = 257.56/x
  3. Step 3: Cross multiply
    307.38x = 424.44 × 257.56
  4. Step 4: Simplify right side
    307.38x = 109,318.77
  5. Step 5: Solve for x
    x = 109,318.77/307.38
  6. Step 6: Final answer
    x = 355.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.