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Finding the Fourth Proportional to 306.87, 423.30 and 188.79

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Solution

The fourth proportional to 306.87, 423.30 and 188.79 is: 260.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.87 : 423.30 = 188.79 : x
  2. Step 2: Convert to fraction form
    306.87/423.30 = 188.79/x
  3. Step 3: Cross multiply
    306.87x = 423.30 × 188.79
  4. Step 4: Simplify right side
    306.87x = 79,914.81
  5. Step 5: Solve for x
    x = 79,914.81/306.87
  6. Step 6: Final answer
    x = 260.42

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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.