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Finding the Fourth Proportional to 125.22, 172.71 and 87.93

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Solution

The fourth proportional to 125.22, 172.71 and 87.93 is: 121.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.22 : 172.71 = 87.93 : x
  2. Step 2: Convert to fraction form
    125.22/172.71 = 87.93/x
  3. Step 3: Cross multiply
    125.22x = 172.71 × 87.93
  4. Step 4: Simplify right side
    125.22x = 15,186.39
  5. Step 5: Solve for x
    x = 15,186.39/125.22
  6. Step 6: Final answer
    x = 121.28

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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.