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Finding the Fourth Proportional to 138,843.72, 191,603.88 and 78,426.90

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Solution

The fourth proportional to 138,843.72, 191,603.88 and 78,426.90 is: 108,228.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,843.72 : 191,603.88 = 78,426.90 : x
  2. Step 2: Convert to fraction form
    138,843.72/191,603.88 = 78,426.90/x
  3. Step 3: Cross multiply
    138,843.72x = 191,603.88 × 78,426.90
  4. Step 4: Simplify right side
    138,843.72x = 15,026,898,336.37
  5. Step 5: Solve for x
    x = 15,026,898,336.37/138,843.72
  6. Step 6: Final answer
    x = 108,228.87

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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.