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Finding the Fourth Proportional to 66,972.80, 100,574.40 and 47,388.80

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Solution

The fourth proportional to 66,972.80, 100,574.40 and 47,388.80 is: 71,164.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,972.80 : 100,574.40 = 47,388.80 : x
  2. Step 2: Convert to fraction form
    66,972.80/100,574.40 = 47,388.80/x
  3. Step 3: Cross multiply
    66,972.80x = 100,574.40 × 47,388.80
  4. Step 4: Simplify right side
    66,972.80x = 4,766,100,126.72
  5. Step 5: Solve for x
    x = 4,766,100,126.72/66,972.80
  6. Step 6: Final answer
    x = 71,164.71

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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.