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Finding the Fourth Proportional to 138,645.96, 191,331.54 and 74,983.83

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Solution

The fourth proportional to 138,645.96, 191,331.54 and 74,983.83 is: 103,477.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,645.96 : 191,331.54 = 74,983.83 : x
  2. Step 2: Convert to fraction form
    138,645.96/191,331.54 = 74,983.83/x
  3. Step 3: Cross multiply
    138,645.96x = 191,331.54 × 74,983.83
  4. Step 4: Simplify right side
    138,645.96x = 14,346,771,669.00
  5. Step 5: Solve for x
    x = 14,346,771,669.00/138,645.96
  6. Step 6: Final answer
    x = 103,477.75

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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.