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Finding the Fourth Proportional to 112,469.60, 155,146.60 and 72,138.48

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Solution

The fourth proportional to 112,469.60, 155,146.60 and 72,138.48 is: 99,511.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,469.60 : 155,146.60 = 72,138.48 : x
  2. Step 2: Convert to fraction form
    112,469.60/155,146.60 = 72,138.48/x
  3. Step 3: Cross multiply
    112,469.60x = 155,146.60 × 72,138.48
  4. Step 4: Simplify right side
    112,469.60x = 11,192,039,901.17
  5. Step 5: Solve for x
    x = 11,192,039,901.17/112,469.60
  6. Step 6: Final answer
    x = 99,511.69

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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.