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Finding the Fourth Proportional to 401.55, 602.12 and 127.64

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Solution

The fourth proportional to 401.55, 602.12 and 127.64 is: 191.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.55 : 602.12 = 127.64 : x
  2. Step 2: Convert to fraction form
    401.55/602.12 = 127.64/x
  3. Step 3: Cross multiply
    401.55x = 602.12 × 127.64
  4. Step 4: Simplify right side
    401.55x = 76,850.95
  5. Step 5: Solve for x
    x = 76,850.95/401.55
  6. Step 6: Final answer
    x = 191.39

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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.