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Finding the Fourth Proportional to 407.45, 611.20 and 133.58

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Solution

The fourth proportional to 407.45, 611.20 and 133.58 is: 200.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.45 : 611.20 = 133.58 : x
  2. Step 2: Convert to fraction form
    407.45/611.20 = 133.58/x
  3. Step 3: Cross multiply
    407.45x = 611.20 × 133.58
  4. Step 4: Simplify right side
    407.45x = 81,644.10
  5. Step 5: Solve for x
    x = 81,644.10/407.45
  6. Step 6: Final answer
    x = 200.38

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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.