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Finding the Fourth Proportional to 71,386.80, 107,080.20 and 21,474.60

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Solution

The fourth proportional to 71,386.80, 107,080.20 and 21,474.60 is: 32,211.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,386.80 : 107,080.20 = 21,474.60 : x
  2. Step 2: Convert to fraction form
    71,386.80/107,080.20 = 21,474.60/x
  3. Step 3: Cross multiply
    71,386.80x = 107,080.20 × 21,474.60
  4. Step 4: Simplify right side
    71,386.80x = 2,299,504,462.92
  5. Step 5: Solve for x
    x = 2,299,504,462.92/71,386.80
  6. Step 6: Final answer
    x = 32,211.90

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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.