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Finding the Fourth Proportional to 307.86, 424.74 and 189.80

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Solution

The fourth proportional to 307.86, 424.74 and 189.80 is: 261.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.86 : 424.74 = 189.80 : x
  2. Step 2: Convert to fraction form
    307.86/424.74 = 189.80/x
  3. Step 3: Cross multiply
    307.86x = 424.74 × 189.80
  4. Step 4: Simplify right side
    307.86x = 80,615.65
  5. Step 5: Solve for x
    x = 80,615.65/307.86
  6. Step 6: Final answer
    x = 261.86

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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.