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Finding the Third Proportional to 90,720.56 and 140,236.88

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Solution

The third proportional to 90,720.56 and 140,236.88 is: 216,779.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,720.56 : 140,236.88 = 140,236.88 : x
  2. Step 2: Convert to fraction form
    90,720.56/140,236.88 = 140,236.88/x
  3. Step 3: Cross multiply
    90,720.56x = 140,236.88 × 140,236.88
  4. Step 4: Simplify right side
    90,720.56x = 19,666,381,109.77
  5. Step 5: Solve for x
    x = 19,666,381,109.77/90,720.56
  6. Step 6: Final answer
    x = 216,779.75

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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.