Home / 138,542.55-191,184.89-78,112.67

Finding the Fourth Proportional to 138,542.55, 191,184.89 and 78,112.67

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Solution

The fourth proportional to 138,542.55, 191,184.89 and 78,112.67 is: 107,793.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,542.55 : 191,184.89 = 78,112.67 : x
  2. Step 2: Convert to fraction form
    138,542.55/191,184.89 = 78,112.67/x
  3. Step 3: Cross multiply
    138,542.55x = 191,184.89 × 78,112.67
  4. Step 4: Simplify right side
    138,542.55x = 14,933,960,875.07
  5. Step 5: Solve for x
    x = 14,933,960,875.07/138,542.55
  6. Step 6: Final answer
    x = 107,793.32

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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.