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Finding the Fourth Proportional to 128,909.80, 193,364.70 and 127,160.20

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Solution

The fourth proportional to 128,909.80, 193,364.70 and 127,160.20 is: 190,740.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,909.80 : 193,364.70 = 127,160.20 : x
  2. Step 2: Convert to fraction form
    128,909.80/193,364.70 = 127,160.20/x
  3. Step 3: Cross multiply
    128,909.80x = 193,364.70 × 127,160.20
  4. Step 4: Simplify right side
    128,909.80x = 24,588,293,924.94
  5. Step 5: Solve for x
    x = 24,588,293,924.94/128,909.80
  6. Step 6: Final answer
    x = 190,740.30

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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.