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Finding the Fourth Proportional to 122,409.20, 183,613.80 and 72,642.80

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Solution

The fourth proportional to 122,409.20, 183,613.80 and 72,642.80 is: 108,964.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,409.20 : 183,613.80 = 72,642.80 : x
  2. Step 2: Convert to fraction form
    122,409.20/183,613.80 = 72,642.80/x
  3. Step 3: Cross multiply
    122,409.20x = 183,613.80 × 72,642.80
  4. Step 4: Simplify right side
    122,409.20x = 13,338,220,550.64
  5. Step 5: Solve for x
    x = 13,338,220,550.64/122,409.20
  6. Step 6: Final answer
    x = 108,964.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.