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Finding the Fourth Proportional to 124.94, 172.32 and 86.12

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Solution

The fourth proportional to 124.94, 172.32 and 86.12 is: 118.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.94 : 172.32 = 86.12 : x
  2. Step 2: Convert to fraction form
    124.94/172.32 = 86.12/x
  3. Step 3: Cross multiply
    124.94x = 172.32 × 86.12
  4. Step 4: Simplify right side
    124.94x = 14,840.20
  5. Step 5: Solve for x
    x = 14,840.20/124.94
  6. Step 6: Final answer
    x = 118.78

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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.