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Finding the Fourth Proportional to 128,530.60, 192,795.90 and 127,364.20

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Solution

The fourth proportional to 128,530.60, 192,795.90 and 127,364.20 is: 191,046.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,530.60 : 192,795.90 = 127,364.20 : x
  2. Step 2: Convert to fraction form
    128,530.60/192,795.90 = 127,364.20/x
  3. Step 3: Cross multiply
    128,530.60x = 192,795.90 × 127,364.20
  4. Step 4: Simplify right side
    128,530.60x = 24,555,295,566.78
  5. Step 5: Solve for x
    x = 24,555,295,566.78/128,530.60
  6. Step 6: Final answer
    x = 191,046.30

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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.