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Finding the Fourth Proportional to 138,745.60, 208,067.20 and 45,254.40

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Solution

The fourth proportional to 138,745.60, 208,067.20 and 45,254.40 is: 67,864.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,745.60 : 208,067.20 = 45,254.40 : x
  2. Step 2: Convert to fraction form
    138,745.60/208,067.20 = 45,254.40/x
  3. Step 3: Cross multiply
    138,745.60x = 208,067.20 × 45,254.40
  4. Step 4: Simplify right side
    138,745.60x = 9,415,956,295.68
  5. Step 5: Solve for x
    x = 9,415,956,295.68/138,745.60
  6. Step 6: Final answer
    x = 67,864.90

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1.5x scale

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.