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Finding the Fourth Proportional to 138,744.90, 208,117.35 and 68,760.90

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Solution

The fourth proportional to 138,744.90, 208,117.35 and 68,760.90 is: 103,141.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,744.90 : 208,117.35 = 68,760.90 : x
  2. Step 2: Convert to fraction form
    138,744.90/208,117.35 = 68,760.90/x
  3. Step 3: Cross multiply
    138,744.90x = 208,117.35 × 68,760.90
  4. Step 4: Simplify right side
    138,744.90x = 14,310,336,291.62
  5. Step 5: Solve for x
    x = 14,310,336,291.62/138,744.90
  6. Step 6: Final answer
    x = 103,141.35

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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.