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Finding the Fourth Proportional to 124.95, 172.56 and 111.15

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Solution

The fourth proportional to 124.95, 172.56 and 111.15 is: 153.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.95 : 172.56 = 111.15 : x
  2. Step 2: Convert to fraction form
    124.95/172.56 = 111.15/x
  3. Step 3: Cross multiply
    124.95x = 172.56 × 111.15
  4. Step 4: Simplify right side
    124.95x = 19,180.04
  5. Step 5: Solve for x
    x = 19,180.04/124.95
  6. Step 6: Final answer
    x = 153.50

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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.