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Finding the Fourth Proportional to 136,367.74, 188,220.63 and 78,997.78

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Solution

The fourth proportional to 136,367.74, 188,220.63 and 78,997.78 is: 109,036.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,367.74 : 188,220.63 = 78,997.78 : x
  2. Step 2: Convert to fraction form
    136,367.74/188,220.63 = 78,997.78/x
  3. Step 3: Cross multiply
    136,367.74x = 188,220.63 × 78,997.78
  4. Step 4: Simplify right side
    136,367.74x = 14,869,011,920.20
  5. Step 5: Solve for x
    x = 14,869,011,920.20/136,367.74
  6. Step 6: Final answer
    x = 109,036.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.