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Finding the Fourth Proportional to 124.60, 172.06 and 91.80

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Solution

The fourth proportional to 124.60, 172.06 and 91.80 is: 126.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.60 : 172.06 = 91.80 : x
  2. Step 2: Convert to fraction form
    124.60/172.06 = 91.80/x
  3. Step 3: Cross multiply
    124.60x = 172.06 × 91.80
  4. Step 4: Simplify right side
    124.60x = 15,795.11
  5. Step 5: Solve for x
    x = 15,795.11/124.60
  6. Step 6: Final answer
    x = 126.77

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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.