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Finding the Fourth Proportional to 122,107.91, 168,510.59 and 79,642.07

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Solution

The fourth proportional to 122,107.91, 168,510.59 and 79,642.07 is: 109,907.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,107.91 : 168,510.59 = 79,642.07 : x
  2. Step 2: Convert to fraction form
    122,107.91/168,510.59 = 79,642.07/x
  3. Step 3: Cross multiply
    122,107.91x = 168,510.59 × 79,642.07
  4. Step 4: Simplify right side
    122,107.91x = 13,420,531,561.07
  5. Step 5: Solve for x
    x = 13,420,531,561.07/122,107.91
  6. Step 6: Final answer
    x = 109,907.15

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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.