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Finding the Fourth Proportional to 307.80, 424.76 and 167.91

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Solution

The fourth proportional to 307.80, 424.76 and 167.91 is: 231.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.80 : 424.76 = 167.91 : x
  2. Step 2: Convert to fraction form
    307.80/424.76 = 167.91/x
  3. Step 3: Cross multiply
    307.80x = 424.76 × 167.91
  4. Step 4: Simplify right side
    307.80x = 71,322.83
  5. Step 5: Solve for x
    x = 71,322.83/307.80
  6. Step 6: Final answer
    x = 231.72

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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.