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Finding the Fourth Proportional to 305.26, 421.24 and 188.80

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Solution

The fourth proportional to 305.26, 421.24 and 188.80 is: 260.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.26 : 421.24 = 188.80 : x
  2. Step 2: Convert to fraction form
    305.26/421.24 = 188.80/x
  3. Step 3: Cross multiply
    305.26x = 421.24 × 188.80
  4. Step 4: Simplify right side
    305.26x = 79,530.11
  5. Step 5: Solve for x
    x = 79,530.11/305.26
  6. Step 6: Final answer
    x = 260.53

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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.