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Finding the Fourth Proportional to 124.89, 172.31 and 75.08

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Solution

The fourth proportional to 124.89, 172.31 and 75.08 is: 103.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.89 : 172.31 = 75.08 : x
  2. Step 2: Convert to fraction form
    124.89/172.31 = 75.08/x
  3. Step 3: Cross multiply
    124.89x = 172.31 × 75.08
  4. Step 4: Simplify right side
    124.89x = 12,935.80
  5. Step 5: Solve for x
    x = 12,935.80/124.89
  6. Step 6: Final answer
    x = 103.58

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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.