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Finding the Fourth Proportional to 71,423.80, 107,135.70 and 21,511.60

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Solution

The fourth proportional to 71,423.80, 107,135.70 and 21,511.60 is: 32,267.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,423.80 : 107,135.70 = 21,511.60 : x
  2. Step 2: Convert to fraction form
    71,423.80/107,135.70 = 21,511.60/x
  3. Step 3: Cross multiply
    71,423.80x = 107,135.70 × 21,511.60
  4. Step 4: Simplify right side
    71,423.80x = 2,304,660,324.12
  5. Step 5: Solve for x
    x = 2,304,660,324.12/71,423.80
  6. Step 6: Final answer
    x = 32,267.40

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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.