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Finding the Fourth Proportional to 124.95, 172.43 and 72.49

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Solution

The fourth proportional to 124.95, 172.43 and 72.49 is: 100.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.95 : 172.43 = 72.49 : x
  2. Step 2: Convert to fraction form
    124.95/172.43 = 72.49/x
  3. Step 3: Cross multiply
    124.95x = 172.43 × 72.49
  4. Step 4: Simplify right side
    124.95x = 12,499.45
  5. Step 5: Solve for x
    x = 12,499.45/124.95
  6. Step 6: Final answer
    x = 100.04

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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.