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Finding the Fourth Proportional to 70,086.62, 105,147.66 and 20,165.64

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Solution

The fourth proportional to 70,086.62, 105,147.66 and 20,165.64 is: 30,253.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,086.62 : 105,147.66 = 20,165.64 : x
  2. Step 2: Convert to fraction form
    70,086.62/105,147.66 = 20,165.64/x
  3. Step 3: Cross multiply
    70,086.62x = 105,147.66 × 20,165.64
  4. Step 4: Simplify right side
    70,086.62x = 2,120,369,858.40
  5. Step 5: Solve for x
    x = 2,120,369,858.40/70,086.62
  6. Step 6: Final answer
    x = 30,253.56

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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.