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Finding the Fourth Proportional to 124.99, 172.45 and 80.75

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Solution

The fourth proportional to 124.99, 172.45 and 80.75 is: 111.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.99 : 172.45 = 80.75 : x
  2. Step 2: Convert to fraction form
    124.99/172.45 = 80.75/x
  3. Step 3: Cross multiply
    124.99x = 172.45 × 80.75
  4. Step 4: Simplify right side
    124.99x = 13,925.34
  5. Step 5: Solve for x
    x = 13,925.34/124.99
  6. Step 6: Final answer
    x = 111.41

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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.