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Finding the Fourth Proportional to 307.67, 424.17 and 253.60

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Solution

The fourth proportional to 307.67, 424.17 and 253.60 is: 349.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.67 : 424.17 = 253.60 : x
  2. Step 2: Convert to fraction form
    307.67/424.17 = 253.60/x
  3. Step 3: Cross multiply
    307.67x = 424.17 × 253.60
  4. Step 4: Simplify right side
    307.67x = 107,568.45
  5. Step 5: Solve for x
    x = 107,568.45/307.67
  6. Step 6: Final answer
    x = 349.63

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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.