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Finding the Fourth Proportional to 138,676, 191,295.12 and 84,987.04

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Solution

The fourth proportional to 138,676, 191,295.12 and 84,987.04 is: 117,234.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,676 : 191,295.12 = 84,987.04 : x
  2. Step 2: Convert to fraction form
    138,676/191,295.12 = 84,987.04/x
  3. Step 3: Cross multiply
    138,676x = 191,295.12 × 84,987.04
  4. Step 4: Simplify right side
    138,676x = 16,257,606,015.24
  5. Step 5: Solve for x
    x = 16,257,606,015.24/138,676
  6. Step 6: Final answer
    x = 117,234.46

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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.