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Finding the Fourth Proportional to 70,053.89, 105,078.11 and 20,133.81

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Solution

The fourth proportional to 70,053.89, 105,078.11 and 20,133.81 is: 30,199.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,053.89 : 105,078.11 = 20,133.81 : x
  2. Step 2: Convert to fraction form
    70,053.89/105,078.11 = 20,133.81/x
  3. Step 3: Cross multiply
    70,053.89x = 105,078.11 × 20,133.81
  4. Step 4: Simplify right side
    70,053.89x = 2,115,622,601.23
  5. Step 5: Solve for x
    x = 2,115,622,601.23/70,053.89
  6. Step 6: Final answer
    x = 30,199.93

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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.