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Finding the Fourth Proportional to 307.72, 424.65 and 169.72

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Solution

The fourth proportional to 307.72, 424.65 and 169.72 is: 234.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.72 : 424.65 = 169.72 : x
  2. Step 2: Convert to fraction form
    307.72/424.65 = 169.72/x
  3. Step 3: Cross multiply
    307.72x = 424.65 × 169.72
  4. Step 4: Simplify right side
    307.72x = 72,071.60
  5. Step 5: Solve for x
    x = 72,071.60/307.72
  6. Step 6: Final answer
    x = 234.21

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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.