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Finding the Fourth Proportional to 66,908.76, 100,368 and 20,165.28

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Solution

The fourth proportional to 66,908.76, 100,368 and 20,165.28 is: 30,249.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,908.76 : 100,368 = 20,165.28 : x
  2. Step 2: Convert to fraction form
    66,908.76/100,368 = 20,165.28/x
  3. Step 3: Cross multiply
    66,908.76x = 100,368 × 20,165.28
  4. Step 4: Simplify right side
    66,908.76x = 2,023,948,823.04
  5. Step 5: Solve for x
    x = 2,023,948,823.04/66,908.76
  6. Step 6: Final answer
    x = 30,249.38

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1.5x scale

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.