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Finding the Third Proportional to 68.63 and 78.19

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Solution

The third proportional to 68.63 and 78.19 is: 89.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.63 : 78.19 = 78.19 : x
  2. Step 2: Convert to fraction form
    68.63/78.19 = 78.19/x
  3. Step 3: Cross multiply
    68.63x = 78.19 × 78.19
  4. Step 4: Simplify right side
    68.63x = 6,113.29
  5. Step 5: Solve for x
    x = 6,113.29/68.63
  6. Step 6: Final answer
    x = 89.08

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Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.