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Finding the Fourth Proportional to 268,636.40, 402,493.80 and 128,092.40

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Solution

The fourth proportional to 268,636.40, 402,493.80 and 128,092.40 is: 191,918.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,636.40 : 402,493.80 = 128,092.40 : x
  2. Step 2: Convert to fraction form
    268,636.40/402,493.80 = 128,092.40/x
  3. Step 3: Cross multiply
    268,636.40x = 402,493.80 × 128,092.40
  4. Step 4: Simplify right side
    268,636.40x = 51,556,396,827.12
  5. Step 5: Solve for x
    x = 51,556,396,827.12/268,636.40
  6. Step 6: Final answer
    x = 191,918.88

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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.