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Finding the Third Proportional to 121 and 187.50

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Solution

The third proportional to 121 and 187.50 is: 290.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    121 : 187.50 = 187.50 : x
  2. Step 2: Convert to fraction form
    121/187.50 = 187.50/x
  3. Step 3: Cross multiply
    121x = 187.50 × 187.50
  4. Step 4: Simplify right side
    121x = 35,156.25
  5. Step 5: Solve for x
    x = 35,156.25/121
  6. Step 6: Final answer
    x = 290.55

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.