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Finding the Fourth Proportional to 138,967.67, 191,704.96 and 87,894.39

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Solution

The fourth proportional to 138,967.67, 191,704.96 and 87,894.39 is: 121,249.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,967.67 : 191,704.96 = 87,894.39 : x
  2. Step 2: Convert to fraction form
    138,967.67/191,704.96 = 87,894.39/x
  3. Step 3: Cross multiply
    138,967.67x = 191,704.96 × 87,894.39
  4. Step 4: Simplify right side
    138,967.67x = 16,849,790,519.17
  5. Step 5: Solve for x
    x = 16,849,790,519.17/138,967.67
  6. Step 6: Final answer
    x = 121,249.72

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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.