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Finding the Fourth Proportional to 407.77, 611.65 and 133.88

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Solution

The fourth proportional to 407.77, 611.65 and 133.88 is: 200.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.77 : 611.65 = 133.88 : x
  2. Step 2: Convert to fraction form
    407.77/611.65 = 133.88/x
  3. Step 3: Cross multiply
    407.77x = 611.65 × 133.88
  4. Step 4: Simplify right side
    407.77x = 81,887.70
  5. Step 5: Solve for x
    x = 81,887.70/407.77
  6. Step 6: Final answer
    x = 200.82

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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.