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Finding the Fourth Proportional to 70,246.50, 105,369.78 and 20,998.50

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Solution

The fourth proportional to 70,246.50, 105,369.78 and 20,998.50 is: 31,497.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,246.50 : 105,369.78 = 20,998.50 : x
  2. Step 2: Convert to fraction form
    70,246.50/105,369.78 = 20,998.50/x
  3. Step 3: Cross multiply
    70,246.50x = 105,369.78 × 20,998.50
  4. Step 4: Simplify right side
    70,246.50x = 2,212,607,325.33
  5. Step 5: Solve for x
    x = 2,212,607,325.33/70,246.50
  6. Step 6: Final answer
    x = 31,497.76

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Double scale
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Similar ratio
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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.