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Finding the Fourth Proportional to 70,472.32, 105,724.04 and 20,556.33

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Solution

The fourth proportional to 70,472.32, 105,724.04 and 20,556.33 is: 30,839.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,472.32 : 105,724.04 = 20,556.33 : x
  2. Step 2: Convert to fraction form
    70,472.32/105,724.04 = 20,556.33/x
  3. Step 3: Cross multiply
    70,472.32x = 105,724.04 × 20,556.33
  4. Step 4: Simplify right side
    70,472.32x = 2,173,297,888.08
  5. Step 5: Solve for x
    x = 2,173,297,888.08/70,472.32
  6. Step 6: Final answer
    x = 30,839.03

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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.