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Finding the Fourth Proportional to 407.56, 611.15 and 129.83

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Solution

The fourth proportional to 407.56, 611.15 and 129.83 is: 194.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.56 : 611.15 = 129.83 : x
  2. Step 2: Convert to fraction form
    407.56/611.15 = 129.83/x
  3. Step 3: Cross multiply
    407.56x = 611.15 × 129.83
  4. Step 4: Simplify right side
    407.56x = 79,345.60
  5. Step 5: Solve for x
    x = 79,345.60/407.56
  6. Step 6: Final answer
    x = 194.69

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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.