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Finding the Fourth Proportional to 85,767.76, 128,645.47 and 26,601.90

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Solution

The fourth proportional to 85,767.76, 128,645.47 and 26,601.90 is: 39,900.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,767.76 : 128,645.47 = 26,601.90 : x
  2. Step 2: Convert to fraction form
    85,767.76/128,645.47 = 26,601.90/x
  3. Step 3: Cross multiply
    85,767.76x = 128,645.47 × 26,601.90
  4. Step 4: Simplify right side
    85,767.76x = 3,422,213,928.39
  5. Step 5: Solve for x
    x = 3,422,213,928.39/85,767.76
  6. Step 6: Final answer
    x = 39,900.94

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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.