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Finding the Fourth Proportional to 124.78, 172.14 and 73

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Solution

The fourth proportional to 124.78, 172.14 and 73 is: 100.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.78 : 172.14 = 73 : x
  2. Step 2: Convert to fraction form
    124.78/172.14 = 73/x
  3. Step 3: Cross multiply
    124.78x = 172.14 × 73
  4. Step 4: Simplify right side
    124.78x = 12,566.22
  5. Step 5: Solve for x
    x = 12,566.22/124.78
  6. Step 6: Final answer
    x = 100.71

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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.