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Finding the Fourth Proportional to 122,405.60, 183,716.40 and 72,423.20

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Solution

The fourth proportional to 122,405.60, 183,716.40 and 72,423.20 is: 108,698.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,405.60 : 183,716.40 = 72,423.20 : x
  2. Step 2: Convert to fraction form
    122,405.60/183,716.40 = 72,423.20/x
  3. Step 3: Cross multiply
    122,405.60x = 183,716.40 × 72,423.20
  4. Step 4: Simplify right side
    122,405.60x = 13,305,329,580.48
  5. Step 5: Solve for x
    x = 13,305,329,580.48/122,405.60
  6. Step 6: Final answer
    x = 108,698.70

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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.