Home / 138,900.62-191,682.05-78,490.82

Finding the Fourth Proportional to 138,900.62, 191,682.05 and 78,490.82

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Solution

The fourth proportional to 138,900.62, 191,682.05 and 78,490.82 is: 108,316.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,900.62 : 191,682.05 = 78,490.82 : x
  2. Step 2: Convert to fraction form
    138,900.62/191,682.05 = 78,490.82/x
  3. Step 3: Cross multiply
    138,900.62x = 191,682.05 × 78,490.82
  4. Step 4: Simplify right side
    138,900.62x = 15,045,281,370.53
  5. Step 5: Solve for x
    x = 15,045,281,370.53/138,900.62
  6. Step 6: Final answer
    x = 108,316.88

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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.