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Finding the Fourth Proportional to 138,665.64, 191,358.66 and 75,003.48

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Solution

The fourth proportional to 138,665.64, 191,358.66 and 75,003.48 is: 103,504.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,665.64 : 191,358.66 = 75,003.48 : x
  2. Step 2: Convert to fraction form
    138,665.64/191,358.66 = 75,003.48/x
  3. Step 3: Cross multiply
    138,665.64x = 191,358.66 × 75,003.48
  4. Step 4: Simplify right side
    138,665.64x = 14,352,565,428.14
  5. Step 5: Solve for x
    x = 14,352,565,428.14/138,665.64
  6. Step 6: Final answer
    x = 103,504.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.