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Finding the Fourth Proportional to 70,472.71, 105,724.61 and 20,556.71

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Solution

The fourth proportional to 70,472.71, 105,724.61 and 20,556.71 is: 30,839.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,472.71 : 105,724.61 = 20,556.71 : x
  2. Step 2: Convert to fraction form
    70,472.71/105,724.61 = 20,556.71/x
  3. Step 3: Cross multiply
    70,472.71x = 105,724.61 × 20,556.71
  4. Step 4: Simplify right side
    70,472.71x = 2,173,350,147.63
  5. Step 5: Solve for x
    x = 2,173,350,147.63/70,472.71
  6. Step 6: Final answer
    x = 30,839.60

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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.