Home / 138,623.40-207,789.30-79,331.40

Finding the Fourth Proportional to 138,623.40, 207,789.30 and 79,331.40

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Solution

The fourth proportional to 138,623.40, 207,789.30 and 79,331.40 is: 118,913.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,623.40 : 207,789.30 = 79,331.40 : x
  2. Step 2: Convert to fraction form
    138,623.40/207,789.30 = 79,331.40/x
  3. Step 3: Cross multiply
    138,623.40x = 207,789.30 × 79,331.40
  4. Step 4: Simplify right side
    138,623.40x = 16,484,216,074.02
  5. Step 5: Solve for x
    x = 16,484,216,074.02/138,623.40
  6. Step 6: Final answer
    x = 118,913.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.