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Finding the Fourth Proportional to 138,999.40, 191,807.62 and 78,566.92

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Solution

The fourth proportional to 138,999.40, 191,807.62 and 78,566.92 is: 108,415.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,999.40 : 191,807.62 = 78,566.92 : x
  2. Step 2: Convert to fraction form
    138,999.40/191,807.62 = 78,566.92/x
  3. Step 3: Cross multiply
    138,999.40x = 191,807.62 × 78,566.92
  4. Step 4: Simplify right side
    138,999.40x = 15,069,733,935.93
  5. Step 5: Solve for x
    x = 15,069,733,935.93/138,999.40
  6. Step 6: Final answer
    x = 108,415.82

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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.