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Finding the Fourth Proportional to 307.42, 423.88 and 245.20

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Solution

The fourth proportional to 307.42, 423.88 and 245.20 is: 338.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.42 : 423.88 = 245.20 : x
  2. Step 2: Convert to fraction form
    307.42/423.88 = 245.20/x
  3. Step 3: Cross multiply
    307.42x = 423.88 × 245.20
  4. Step 4: Simplify right side
    307.42x = 103,933.70
  5. Step 5: Solve for x
    x = 103,933.70/307.42
  6. Step 6: Final answer
    x = 338.09

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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.