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Finding the Fourth Proportional to 306.61, 423.17 and 190.21

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Solution

The fourth proportional to 306.61, 423.17 and 190.21 is: 262.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.61 : 423.17 = 190.21 : x
  2. Step 2: Convert to fraction form
    306.61/423.17 = 190.21/x
  3. Step 3: Cross multiply
    306.61x = 423.17 × 190.21
  4. Step 4: Simplify right side
    306.61x = 80,490.21
  5. Step 5: Solve for x
    x = 80,490.21/306.61
  6. Step 6: Final answer
    x = 262.52

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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.