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Finding the Fourth Proportional to 307.72, 424.56 and 197.20

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Solution

The fourth proportional to 307.72, 424.56 and 197.20 is: 272.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.72 : 424.56 = 197.20 : x
  2. Step 2: Convert to fraction form
    307.72/424.56 = 197.20/x
  3. Step 3: Cross multiply
    307.72x = 424.56 × 197.20
  4. Step 4: Simplify right side
    307.72x = 83,723.23
  5. Step 5: Solve for x
    x = 83,723.23/307.72
  6. Step 6: Final answer
    x = 272.08

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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.