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Finding the Fourth Proportional to 138,866.66, 191,639.50 and 85,181.28

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Solution

The fourth proportional to 138,866.66, 191,639.50 and 85,181.28 is: 117,552.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,866.66 : 191,639.50 = 85,181.28 : x
  2. Step 2: Convert to fraction form
    138,866.66/191,639.50 = 85,181.28/x
  3. Step 3: Cross multiply
    138,866.66x = 191,639.50 × 85,181.28
  4. Step 4: Simplify right side
    138,866.66x = 16,324,097,908.56
  5. Step 5: Solve for x
    x = 16,324,097,908.56/138,866.66
  6. Step 6: Final answer
    x = 117,552.32

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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.