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Finding the Third Proportional to 55.63 and 87.69

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Solution

The third proportional to 55.63 and 87.69 is: 138.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.63 : 87.69 = 87.69 : x
  2. Step 2: Convert to fraction form
    55.63/87.69 = 87.69/x
  3. Step 3: Cross multiply
    55.63x = 87.69 × 87.69
  4. Step 4: Simplify right side
    55.63x = 7,689.10
  5. Step 5: Solve for x
    x = 7,689.10/55.63
  6. Step 6: Final answer
    x = 138.23

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.