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Finding the Fourth Proportional to 71,906.40, 107,859.61 and 21,986.50

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Solution

The fourth proportional to 71,906.40, 107,859.61 and 21,986.50 is: 32,979.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,906.40 : 107,859.61 = 21,986.50 : x
  2. Step 2: Convert to fraction form
    71,906.40/107,859.61 = 21,986.50/x
  3. Step 3: Cross multiply
    71,906.40x = 107,859.61 × 21,986.50
  4. Step 4: Simplify right side
    71,906.40x = 2,371,455,315.27
  5. Step 5: Solve for x
    x = 2,371,455,315.27/71,906.40
  6. Step 6: Final answer
    x = 32,979.75

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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.