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Finding the Fourth Proportional to 60,711.40, 91,069.80 and 20,729.80

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Solution

The fourth proportional to 60,711.40, 91,069.80 and 20,729.80 is: 31,095.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,711.40 : 91,069.80 = 20,729.80 : x
  2. Step 2: Convert to fraction form
    60,711.40/91,069.80 = 20,729.80/x
  3. Step 3: Cross multiply
    60,711.40x = 91,069.80 × 20,729.80
  4. Step 4: Simplify right side
    60,711.40x = 1,887,858,740.04
  5. Step 5: Solve for x
    x = 1,887,858,740.04/60,711.40
  6. Step 6: Final answer
    x = 31,095.62

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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.