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Finding the Fourth Proportional to 128,287.60, 192,435.80 and 39,540.40

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Solution

The fourth proportional to 128,287.60, 192,435.80 and 39,540.40 is: 59,311.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,287.60 : 192,435.80 = 39,540.40 : x
  2. Step 2: Convert to fraction form
    128,287.60/192,435.80 = 39,540.40/x
  3. Step 3: Cross multiply
    128,287.60x = 192,435.80 × 39,540.40
  4. Step 4: Simplify right side
    128,287.60x = 7,608,988,506.32
  5. Step 5: Solve for x
    x = 7,608,988,506.32/128,287.60
  6. Step 6: Final answer
    x = 59,311.96

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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.