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Finding the Fourth Proportional to 139,891.21, 209,898.78 and 73,315.42

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Solution

The fourth proportional to 139,891.21, 209,898.78 and 73,315.42 is: 110,005.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,891.21 : 209,898.78 = 73,315.42 : x
  2. Step 2: Convert to fraction form
    139,891.21/209,898.78 = 73,315.42/x
  3. Step 3: Cross multiply
    139,891.21x = 209,898.78 × 73,315.42
  4. Step 4: Simplify right side
    139,891.21x = 15,388,817,213.19
  5. Step 5: Solve for x
    x = 15,388,817,213.19/139,891.21
  6. Step 6: Final answer
    x = 110,005.61

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1.5x scale

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.