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Finding the Fourth Proportional to 91,321.40, 137,003.70 and 28,991.90

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Solution

The fourth proportional to 91,321.40, 137,003.70 and 28,991.90 is: 43,494.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,321.40 : 137,003.70 = 28,991.90 : x
  2. Step 2: Convert to fraction form
    91,321.40/137,003.70 = 28,991.90/x
  3. Step 3: Cross multiply
    91,321.40x = 137,003.70 × 28,991.90
  4. Step 4: Simplify right side
    91,321.40x = 3,971,997,570.03
  5. Step 5: Solve for x
    x = 3,971,997,570.03/91,321.40
  6. Step 6: Final answer
    x = 43,494.71

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1.5x scale

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.