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Finding the Fourth Proportional to 66,918.80, 100,378.20 and 51,172.40

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Solution

The fourth proportional to 66,918.80, 100,378.20 and 51,172.40 is: 76,758.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,918.80 : 100,378.20 = 51,172.40 : x
  2. Step 2: Convert to fraction form
    66,918.80/100,378.20 = 51,172.40/x
  3. Step 3: Cross multiply
    66,918.80x = 100,378.20 × 51,172.40
  4. Step 4: Simplify right side
    66,918.80x = 5,136,593,401.68
  5. Step 5: Solve for x
    x = 5,136,593,401.68/66,918.80
  6. Step 6: Final answer
    x = 76,758.60

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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.