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Finding the Fourth Proportional to 306.97, 423.51 and 188.90

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Solution

The fourth proportional to 306.97, 423.51 and 188.90 is: 260.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.97 : 423.51 = 188.90 : x
  2. Step 2: Convert to fraction form
    306.97/423.51 = 188.90/x
  3. Step 3: Cross multiply
    306.97x = 423.51 × 188.90
  4. Step 4: Simplify right side
    306.97x = 79,999.80
  5. Step 5: Solve for x
    x = 79,999.80/306.97
  6. Step 6: Final answer
    x = 260.61

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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.