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Finding the Fourth Proportional to 407.89, 611.91 and 191.47

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Solution

The fourth proportional to 407.89, 611.91 and 191.47 is: 287.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.89 : 611.91 = 191.47 : x
  2. Step 2: Convert to fraction form
    407.89/611.91 = 191.47/x
  3. Step 3: Cross multiply
    407.89x = 611.91 × 191.47
  4. Step 4: Simplify right side
    407.89x = 117,162.41
  5. Step 5: Solve for x
    x = 117,162.41/407.89
  6. Step 6: Final answer
    x = 287.24

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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.