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Finding the Fourth Proportional to 307.81, 424.74 and 173.22

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Solution

The fourth proportional to 307.81, 424.74 and 173.22 is: 239.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.81 : 424.74 = 173.22 : x
  2. Step 2: Convert to fraction form
    307.81/424.74 = 173.22/x
  3. Step 3: Cross multiply
    307.81x = 424.74 × 173.22
  4. Step 4: Simplify right side
    307.81x = 73,573.46
  5. Step 5: Solve for x
    x = 73,573.46/307.81
  6. Step 6: Final answer
    x = 239.02

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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.