Home / 138,739.88-208,138.98-45,311.24

Finding the Fourth Proportional to 138,739.88, 208,138.98 and 45,311.24

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Solution

The fourth proportional to 138,739.88, 208,138.98 and 45,311.24 is: 67,976.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,739.88 : 208,138.98 = 45,311.24 : x
  2. Step 2: Convert to fraction form
    138,739.88/208,138.98 = 45,311.24/x
  3. Step 3: Cross multiply
    138,739.88x = 208,138.98 × 45,311.24
  4. Step 4: Simplify right side
    138,739.88x = 9,431,035,276.14
  5. Step 5: Solve for x
    x = 9,431,035,276.14/138,739.88
  6. Step 6: Final answer
    x = 67,976.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.