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Finding the Fourth Proportional to 70,610.81, 105,919.85 and 18,020.75

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Solution

The fourth proportional to 70,610.81, 105,919.85 and 18,020.75 is: 27,032.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,610.81 : 105,919.85 = 18,020.75 : x
  2. Step 2: Convert to fraction form
    70,610.81/105,919.85 = 18,020.75/x
  3. Step 3: Cross multiply
    70,610.81x = 105,919.85 × 18,020.75
  4. Step 4: Simplify right side
    70,610.81x = 1,908,754,652.34
  5. Step 5: Solve for x
    x = 1,908,754,652.34/70,610.81
  6. Step 6: Final answer
    x = 27,032.05

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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.