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Finding the Fourth Proportional to 70,529.64, 105,808.18 and 20,609.98

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Solution

The fourth proportional to 70,529.64, 105,808.18 and 20,609.98 is: 30,918.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,529.64 : 105,808.18 = 20,609.98 : x
  2. Step 2: Convert to fraction form
    70,529.64/105,808.18 = 20,609.98/x
  3. Step 3: Cross multiply
    70,529.64x = 105,808.18 × 20,609.98
  4. Step 4: Simplify right side
    70,529.64x = 2,180,704,473.64
  5. Step 5: Solve for x
    x = 2,180,704,473.64/70,529.64
  6. Step 6: Final answer
    x = 30,918.98

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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.