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Finding the Fourth Proportional to 60,806.40, 91,209.60 and 39,811.20

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Solution

The fourth proportional to 60,806.40, 91,209.60 and 39,811.20 is: 59,716.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,806.40 : 91,209.60 = 39,811.20 : x
  2. Step 2: Convert to fraction form
    60,806.40/91,209.60 = 39,811.20/x
  3. Step 3: Cross multiply
    60,806.40x = 91,209.60 × 39,811.20
  4. Step 4: Simplify right side
    60,806.40x = 3,631,163,627.52
  5. Step 5: Solve for x
    x = 3,631,163,627.52/60,806.40
  6. Step 6: Final answer
    x = 59,716.80

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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.