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Finding the Fourth Proportional to 306.67, 423.16 and 188.70

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Solution

The fourth proportional to 306.67, 423.16 and 188.70 is: 260.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.67 : 423.16 = 188.70 : x
  2. Step 2: Convert to fraction form
    306.67/423.16 = 188.70/x
  3. Step 3: Cross multiply
    306.67x = 423.16 × 188.70
  4. Step 4: Simplify right side
    306.67x = 79,849.82
  5. Step 5: Solve for x
    x = 79,849.82/306.67
  6. Step 6: Final answer
    x = 260.38

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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.