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Finding the Fourth Proportional to 125.14, 172.68 and 72.70

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Solution

The fourth proportional to 125.14, 172.68 and 72.70 is: 100.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.14 : 172.68 = 72.70 : x
  2. Step 2: Convert to fraction form
    125.14/172.68 = 72.70/x
  3. Step 3: Cross multiply
    125.14x = 172.68 × 72.70
  4. Step 4: Simplify right side
    125.14x = 12,552.97
  5. Step 5: Solve for x
    x = 12,552.97/125.14
  6. Step 6: Final answer
    x = 100.32

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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.