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Finding the Fourth Proportional to 70,538.70, 105,817.98 and 20,622.57

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Solution

The fourth proportional to 70,538.70, 105,817.98 and 20,622.57 is: 30,936.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,538.70 : 105,817.98 = 20,622.57 : x
  2. Step 2: Convert to fraction form
    70,538.70/105,817.98 = 20,622.57/x
  3. Step 3: Cross multiply
    70,538.70x = 105,817.98 × 20,622.57
  4. Step 4: Simplify right side
    70,538.70x = 2,182,238,699.81
  5. Step 5: Solve for x
    x = 2,182,238,699.81/70,538.70
  6. Step 6: Final answer
    x = 30,936.76

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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.