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Finding the Fourth Proportional to 71,838.90, 107,758.01 and 21,918.83

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Solution

The fourth proportional to 71,838.90, 107,758.01 and 21,918.83 is: 32,878.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,838.90 : 107,758.01 = 21,918.83 : x
  2. Step 2: Convert to fraction form
    71,838.90/107,758.01 = 21,918.83/x
  3. Step 3: Cross multiply
    71,838.90x = 107,758.01 × 21,918.83
  4. Step 4: Simplify right side
    71,838.90x = 2,361,928,853.94
  5. Step 5: Solve for x
    x = 2,361,928,853.94/71,838.90
  6. Step 6: Final answer
    x = 32,878.13

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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.