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Finding the Fourth Proportional to 407.74, 611.85 and 191.34

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Solution

The fourth proportional to 407.74, 611.85 and 191.34 is: 287.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.74 : 611.85 = 191.34 : x
  2. Step 2: Convert to fraction form
    407.74/611.85 = 191.34/x
  3. Step 3: Cross multiply
    407.74x = 611.85 × 191.34
  4. Step 4: Simplify right side
    407.74x = 117,071.38
  5. Step 5: Solve for x
    x = 117,071.38/407.74
  6. Step 6: Final answer
    x = 287.12

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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.