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Finding the Fourth Proportional to 90,945.99, 135,707.72 and 81,489.68

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Solution

The fourth proportional to 90,945.99, 135,707.72 and 81,489.68 is: 121,597.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,945.99 : 135,707.72 = 81,489.68 : x
  2. Step 2: Convert to fraction form
    90,945.99/135,707.72 = 81,489.68/x
  3. Step 3: Cross multiply
    90,945.99x = 135,707.72 × 81,489.68
  4. Step 4: Simplify right side
    90,945.99x = 11,058,777,590.34
  5. Step 5: Solve for x
    x = 11,058,777,590.34/90,945.99
  6. Step 6: Final answer
    x = 121,597.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.