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Finding the Fourth Proportional to 67,940.40, 101,920.20 and 21,188.40

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Solution

The fourth proportional to 67,940.40, 101,920.20 and 21,188.40 is: 31,785.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,940.40 : 101,920.20 = 21,188.40 : x
  2. Step 2: Convert to fraction form
    67,940.40/101,920.20 = 21,188.40/x
  3. Step 3: Cross multiply
    67,940.40x = 101,920.20 × 21,188.40
  4. Step 4: Simplify right side
    67,940.40x = 2,159,525,965.68
  5. Step 5: Solve for x
    x = 2,159,525,965.68/67,940.40
  6. Step 6: Final answer
    x = 31,785.59

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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.