Home / 138,739.47-191,469.14-78,320.35

Finding the Fourth Proportional to 138,739.47, 191,469.14 and 78,320.35

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Solution

The fourth proportional to 138,739.47, 191,469.14 and 78,320.35 is: 108,086.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,739.47 : 191,469.14 = 78,320.35 : x
  2. Step 2: Convert to fraction form
    138,739.47/191,469.14 = 78,320.35/x
  3. Step 3: Cross multiply
    138,739.47x = 191,469.14 × 78,320.35
  4. Step 4: Simplify right side
    138,739.47x = 14,995,930,059.00
  5. Step 5: Solve for x
    x = 14,995,930,059.00/138,739.47
  6. Step 6: Final answer
    x = 108,086.98

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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.