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Finding the Fourth Proportional to 91,090.59, 135,720.03 and 85,997.63

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Solution

The fourth proportional to 91,090.59, 135,720.03 and 85,997.63 is: 128,131.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,090.59 : 135,720.03 = 85,997.63 : x
  2. Step 2: Convert to fraction form
    91,090.59/135,720.03 = 85,997.63/x
  3. Step 3: Cross multiply
    91,090.59x = 135,720.03 × 85,997.63
  4. Step 4: Simplify right side
    91,090.59x = 11,671,600,244.93
  5. Step 5: Solve for x
    x = 11,671,600,244.93/91,090.59
  6. Step 6: Final answer
    x = 128,131.79

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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.