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Finding the Fourth Proportional to 67,312.32, 100,919.88 and 20,539.68

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Solution

The fourth proportional to 67,312.32, 100,919.88 and 20,539.68 is: 30,794.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,312.32 : 100,919.88 = 20,539.68 : x
  2. Step 2: Convert to fraction form
    67,312.32/100,919.88 = 20,539.68/x
  3. Step 3: Cross multiply
    67,312.32x = 100,919.88 × 20,539.68
  4. Step 4: Simplify right side
    67,312.32x = 2,072,862,040.84
  5. Step 5: Solve for x
    x = 2,072,862,040.84/67,312.32
  6. Step 6: Final answer
    x = 30,794.69

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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.