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Finding the Fourth Proportional to 128,046.60, 192,069.90 and 121,485.60

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Solution

The fourth proportional to 128,046.60, 192,069.90 and 121,485.60 is: 182,228.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,046.60 : 192,069.90 = 121,485.60 : x
  2. Step 2: Convert to fraction form
    128,046.60/192,069.90 = 121,485.60/x
  3. Step 3: Cross multiply
    128,046.60x = 192,069.90 × 121,485.60
  4. Step 4: Simplify right side
    128,046.60x = 23,333,727,043.44
  5. Step 5: Solve for x
    x = 23,333,727,043.44/128,046.60
  6. Step 6: Final answer
    x = 182,228.40

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1.5x scale

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.