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Finding the Fourth Proportional to 122,105.78, 168,507.66 and 79,639.94

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Solution

The fourth proportional to 122,105.78, 168,507.66 and 79,639.94 is: 109,904.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,105.78 : 168,507.66 = 79,639.94 : x
  2. Step 2: Convert to fraction form
    122,105.78/168,507.66 = 79,639.94/x
  3. Step 3: Cross multiply
    122,105.78x = 168,507.66 × 79,639.94
  4. Step 4: Simplify right side
    122,105.78x = 13,419,939,931.94
  5. Step 5: Solve for x
    x = 13,419,939,931.94/122,105.78
  6. Step 6: Final answer
    x = 109,904.22

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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.