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Finding the Fourth Proportional to 409.86, 614.79 and 136.14

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Solution

The fourth proportional to 409.86, 614.79 and 136.14 is: 204.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.86 : 614.79 = 136.14 : x
  2. Step 2: Convert to fraction form
    409.86/614.79 = 136.14/x
  3. Step 3: Cross multiply
    409.86x = 614.79 × 136.14
  4. Step 4: Simplify right side
    409.86x = 83,697.51
  5. Step 5: Solve for x
    x = 83,697.51/409.86
  6. Step 6: Final answer
    x = 204.21

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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.