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Finding the Fourth Proportional to 138,913.20, 208,078.20 and 115,585.20

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Solution

The fourth proportional to 138,913.20, 208,078.20 and 115,585.20 is: 173,135.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,913.20 : 208,078.20 = 115,585.20 : x
  2. Step 2: Convert to fraction form
    138,913.20/208,078.20 = 115,585.20/x
  3. Step 3: Cross multiply
    138,913.20x = 208,078.20 × 115,585.20
  4. Step 4: Simplify right side
    138,913.20x = 24,050,760,362.64
  5. Step 5: Solve for x
    x = 24,050,760,362.64/138,913.20
  6. Step 6: Final answer
    x = 173,135.17

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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.