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Finding the Fourth Proportional to 138,879.72, 191,653.65 and 75,217.32

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Solution

The fourth proportional to 138,879.72, 191,653.65 and 75,217.32 is: 103,799.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,879.72 : 191,653.65 = 75,217.32 : x
  2. Step 2: Convert to fraction form
    138,879.72/191,653.65 = 75,217.32/x
  3. Step 3: Cross multiply
    138,879.72x = 191,653.65 × 75,217.32
  4. Step 4: Simplify right side
    138,879.72x = 14,415,673,921.22
  5. Step 5: Solve for x
    x = 14,415,673,921.22/138,879.72
  6. Step 6: Final answer
    x = 103,799.70

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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.