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Finding the Fourth Proportional to 307.56, 424.56 and 191.20

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Solution

The fourth proportional to 307.56, 424.56 and 191.20 is: 263.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.56 : 424.56 = 191.20 : x
  2. Step 2: Convert to fraction form
    307.56/424.56 = 191.20/x
  3. Step 3: Cross multiply
    307.56x = 424.56 × 191.20
  4. Step 4: Simplify right side
    307.56x = 81,175.87
  5. Step 5: Solve for x
    x = 81,175.87/307.56
  6. Step 6: Final answer
    x = 263.94

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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.