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Finding the Fourth Proportional to 138,655.80, 191,297.52 and 113,117.67

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Solution

The fourth proportional to 138,655.80, 191,297.52 and 113,117.67 is: 156,063.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,655.80 : 191,297.52 = 113,117.67 : x
  2. Step 2: Convert to fraction form
    138,655.80/191,297.52 = 113,117.67/x
  3. Step 3: Cross multiply
    138,655.80x = 191,297.52 × 113,117.67
  4. Step 4: Simplify right side
    138,655.80x = 21,639,129,739.18
  5. Step 5: Solve for x
    x = 21,639,129,739.18/138,655.80
  6. Step 6: Final answer
    x = 156,063.65

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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.