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Finding the Fourth Proportional to 138,879.39, 191,652.96 and 77,625.50

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Solution

The fourth proportional to 138,879.39, 191,652.96 and 77,625.50 is: 107,122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,879.39 : 191,652.96 = 77,625.50 : x
  2. Step 2: Convert to fraction form
    138,879.39/191,652.96 = 77,625.50/x
  3. Step 3: Cross multiply
    138,879.39x = 191,652.96 × 77,625.50
  4. Step 4: Simplify right side
    138,879.39x = 14,877,156,179.31
  5. Step 5: Solve for x
    x = 14,877,156,179.31/138,879.39
  6. Step 6: Final answer
    x = 107,122.85

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1.5x scale

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.