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Finding the Fourth Proportional to 407.35, 611.12 and 190.81

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Solution

The fourth proportional to 407.35, 611.12 and 190.81 is: 286.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.35 : 611.12 = 190.81 : x
  2. Step 2: Convert to fraction form
    407.35/611.12 = 190.81/x
  3. Step 3: Cross multiply
    407.35x = 611.12 × 190.81
  4. Step 4: Simplify right side
    407.35x = 116,607.81
  5. Step 5: Solve for x
    x = 116,607.81/407.35
  6. Step 6: Final answer
    x = 286.26

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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.