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Finding the Fourth Proportional to 71,969.60, 107,954.40 and 66,720.80

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Solution

The fourth proportional to 71,969.60, 107,954.40 and 66,720.80 is: 100,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,969.60 : 107,954.40 = 66,720.80 : x
  2. Step 2: Convert to fraction form
    71,969.60/107,954.40 = 66,720.80/x
  3. Step 3: Cross multiply
    71,969.60x = 107,954.40 × 66,720.80
  4. Step 4: Simplify right side
    71,969.60x = 7,202,803,931.52
  5. Step 5: Solve for x
    x = 7,202,803,931.52/71,969.60
  6. Step 6: Final answer
    x = 100,081.20

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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.