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Finding the Fourth Proportional to 136,686.94, 188,632.65 and 79,321.84

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Solution

The fourth proportional to 136,686.94, 188,632.65 and 79,321.84 is: 109,466.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,686.94 : 188,632.65 = 79,321.84 : x
  2. Step 2: Convert to fraction form
    136,686.94/188,632.65 = 79,321.84/x
  3. Step 3: Cross multiply
    136,686.94x = 188,632.65 × 79,321.84
  4. Step 4: Simplify right side
    136,686.94x = 14,962,688,882.08
  5. Step 5: Solve for x
    x = 14,962,688,882.08/136,686.94
  6. Step 6: Final answer
    x = 109,466.85

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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.