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Finding the Fourth Proportional to 122,718.65, 169,268.49 and 79,621.15

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Solution

The fourth proportional to 122,718.65, 169,268.49 and 79,621.15 is: 109,823.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,718.65 : 169,268.49 = 79,621.15 : x
  2. Step 2: Convert to fraction form
    122,718.65/169,268.49 = 79,621.15/x
  3. Step 3: Cross multiply
    122,718.65x = 169,268.49 × 79,621.15
  4. Step 4: Simplify right side
    122,718.65x = 13,477,351,832.56
  5. Step 5: Solve for x
    x = 13,477,351,832.56/122,718.65
  6. Step 6: Final answer
    x = 109,823.18

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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.