Home / 90,749.40-135,864.90-81,418.20

Finding the Fourth Proportional to 90,749.40, 135,864.90 and 81,418.20

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Solution

The fourth proportional to 90,749.40, 135,864.90 and 81,418.20 is: 121,894.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,749.40 : 135,864.90 = 81,418.20 : x
  2. Step 2: Convert to fraction form
    90,749.40/135,864.90 = 81,418.20/x
  3. Step 3: Cross multiply
    90,749.40x = 135,864.90 × 81,418.20
  4. Step 4: Simplify right side
    90,749.40x = 11,061,875,601.18
  5. Step 5: Solve for x
    x = 11,061,875,601.18/90,749.40
  6. Step 6: Final answer
    x = 121,894.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.