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Finding the Fourth Proportional to 91,076.55, 135,699.11 and 85,983.57

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Solution

The fourth proportional to 91,076.55, 135,699.11 and 85,983.57 is: 128,110.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,076.55 : 135,699.11 = 85,983.57 : x
  2. Step 2: Convert to fraction form
    91,076.55/135,699.11 = 85,983.57/x
  3. Step 3: Cross multiply
    91,076.55x = 135,699.11 × 85,983.57
  4. Step 4: Simplify right side
    91,076.55x = 11,667,893,493.70
  5. Step 5: Solve for x
    x = 11,667,893,493.70/91,076.55
  6. Step 6: Final answer
    x = 128,110.84

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1.5x scale

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.