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Finding the Fourth Proportional to 70,356.96, 105,540.94 and 20,437.88

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Solution

The fourth proportional to 70,356.96, 105,540.94 and 20,437.88 is: 30,658.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,356.96 : 105,540.94 = 20,437.88 : x
  2. Step 2: Convert to fraction form
    70,356.96/105,540.94 = 20,437.88/x
  3. Step 3: Cross multiply
    70,356.96x = 105,540.94 × 20,437.88
  4. Step 4: Simplify right side
    70,356.96x = 2,157,033,066.81
  5. Step 5: Solve for x
    x = 2,157,033,066.81/70,356.96
  6. Step 6: Final answer
    x = 30,658.42

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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.