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Finding the Fourth Proportional to 124.81, 172.23 and 109.33

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Solution

The fourth proportional to 124.81, 172.23 and 109.33 is: 150.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.81 : 172.23 = 109.33 : x
  2. Step 2: Convert to fraction form
    124.81/172.23 = 109.33/x
  3. Step 3: Cross multiply
    124.81x = 172.23 × 109.33
  4. Step 4: Simplify right side
    124.81x = 18,829.91
  5. Step 5: Solve for x
    x = 18,829.91/124.81
  6. Step 6: Final answer
    x = 150.87

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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.