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Finding the Fourth Proportional to 307.76, 424.08 and 245.60

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Solution

The fourth proportional to 307.76, 424.08 and 245.60 is: 338.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.76 : 424.08 = 245.60 : x
  2. Step 2: Convert to fraction form
    307.76/424.08 = 245.60/x
  3. Step 3: Cross multiply
    307.76x = 424.08 × 245.60
  4. Step 4: Simplify right side
    307.76x = 104,154.05
  5. Step 5: Solve for x
    x = 104,154.05/307.76
  6. Step 6: Final answer
    x = 338.43

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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.