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Finding the Fourth Proportional to 70,609.20, 105,913.74 and 18,018.69

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Solution

The fourth proportional to 70,609.20, 105,913.74 and 18,018.69 is: 27,028.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,609.20 : 105,913.74 = 18,018.69 : x
  2. Step 2: Convert to fraction form
    70,609.20/105,913.74 = 18,018.69/x
  3. Step 3: Cross multiply
    70,609.20x = 105,913.74 × 18,018.69
  4. Step 4: Simplify right side
    70,609.20x = 1,908,426,847.80
  5. Step 5: Solve for x
    x = 1,908,426,847.80/70,609.20
  6. Step 6: Final answer
    x = 27,028.02

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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.