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Finding the Third Proportional to 153 and 216.75

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Solution

The third proportional to 153 and 216.75 is: 307.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    153 : 216.75 = 216.75 : x
  2. Step 2: Convert to fraction form
    153/216.75 = 216.75/x
  3. Step 3: Cross multiply
    153x = 216.75 × 216.75
  4. Step 4: Simplify right side
    153x = 46,980.56
  5. Step 5: Solve for x
    x = 46,980.56/153
  6. Step 6: Final answer
    x = 307.06

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.