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Finding the Fourth Proportional to 407.81, 611.72 and 133.90

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Solution

The fourth proportional to 407.81, 611.72 and 133.90 is: 200.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.81 : 611.72 = 133.90 : x
  2. Step 2: Convert to fraction form
    407.81/611.72 = 133.90/x
  3. Step 3: Cross multiply
    407.81x = 611.72 × 133.90
  4. Step 4: Simplify right side
    407.81x = 81,909.31
  5. Step 5: Solve for x
    x = 81,909.31/407.81
  6. Step 6: Final answer
    x = 200.85

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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.