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Finding the Fourth Proportional to 91,811.20, 137,716.80 and 65,084.80

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Solution

The fourth proportional to 91,811.20, 137,716.80 and 65,084.80 is: 97,627.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,811.20 : 137,716.80 = 65,084.80 : x
  2. Step 2: Convert to fraction form
    91,811.20/137,716.80 = 65,084.80/x
  3. Step 3: Cross multiply
    91,811.20x = 137,716.80 × 65,084.80
  4. Step 4: Simplify right side
    91,811.20x = 8,963,270,384.64
  5. Step 5: Solve for x
    x = 8,963,270,384.64/91,811.20
  6. Step 6: Final answer
    x = 97,627.20

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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.