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Finding the Fourth Proportional to 125.15, 172.61 and 111.02

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Solution

The fourth proportional to 125.15, 172.61 and 111.02 is: 153.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.15 : 172.61 = 111.02 : x
  2. Step 2: Convert to fraction form
    125.15/172.61 = 111.02/x
  3. Step 3: Cross multiply
    125.15x = 172.61 × 111.02
  4. Step 4: Simplify right side
    125.15x = 19,163.76
  5. Step 5: Solve for x
    x = 19,163.76/125.15
  6. Step 6: Final answer
    x = 153.13

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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.