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Finding the Fourth Proportional to 91,810.40, 137,715.60 and 84,228.80

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Solution

The fourth proportional to 91,810.40, 137,715.60 and 84,228.80 is: 126,343.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,810.40 : 137,715.60 = 84,228.80 : x
  2. Step 2: Convert to fraction form
    91,810.40/137,715.60 = 84,228.80/x
  3. Step 3: Cross multiply
    91,810.40x = 137,715.60 × 84,228.80
  4. Step 4: Simplify right side
    91,810.40x = 11,599,619,729.28
  5. Step 5: Solve for x
    x = 11,599,619,729.28/91,810.40
  6. Step 6: Final answer
    x = 126,343.20

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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.