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Finding the Fourth Proportional to 139,989.48, 209,776.78 and 115,205.64

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Solution

The fourth proportional to 139,989.48, 209,776.78 and 115,205.64 is: 172,637.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,989.48 : 209,776.78 = 115,205.64 : x
  2. Step 2: Convert to fraction form
    139,989.48/209,776.78 = 115,205.64/x
  3. Step 3: Cross multiply
    139,989.48x = 209,776.78 × 115,205.64
  4. Step 4: Simplify right side
    139,989.48x = 24,167,468,197.04
  5. Step 5: Solve for x
    x = 24,167,468,197.04/139,989.48
  6. Step 6: Final answer
    x = 172,637.75

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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.