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Finding the Fourth Proportional to 138,756.48, 191,513.92 and 87,736.64

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Solution

The fourth proportional to 138,756.48, 191,513.92 and 87,736.64 is: 121,095.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,756.48 : 191,513.92 = 87,736.64 : x
  2. Step 2: Convert to fraction form
    138,756.48/191,513.92 = 87,736.64/x
  3. Step 3: Cross multiply
    138,756.48x = 191,513.92 × 87,736.64
  4. Step 4: Simplify right side
    138,756.48x = 16,802,787,854.03
  5. Step 5: Solve for x
    x = 16,802,787,854.03/138,756.48
  6. Step 6: Final answer
    x = 121,095.52

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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.