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Finding the Fourth Proportional to 66,862.70, 100,308.45 and 20,120.30

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Solution

The fourth proportional to 66,862.70, 100,308.45 and 20,120.30 is: 30,184.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,862.70 : 100,308.45 = 20,120.30 : x
  2. Step 2: Convert to fraction form
    66,862.70/100,308.45 = 20,120.30/x
  3. Step 3: Cross multiply
    66,862.70x = 100,308.45 × 20,120.30
  4. Step 4: Simplify right side
    66,862.70x = 2,018,236,106.54
  5. Step 5: Solve for x
    x = 2,018,236,106.54/66,862.70
  6. Step 6: Final answer
    x = 30,184.78

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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.