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Finding the Fourth Proportional to 611.99, 916.41 and 405.92

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Solution

The fourth proportional to 611.99, 916.41 and 405.92 is: 607.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.99 : 916.41 = 405.92 : x
  2. Step 2: Convert to fraction form
    611.99/916.41 = 405.92/x
  3. Step 3: Cross multiply
    611.99x = 916.41 × 405.92
  4. Step 4: Simplify right side
    611.99x = 371,984.57
  5. Step 5: Solve for x
    x = 371,984.57/611.99
  6. Step 6: Final answer
    x = 607.83

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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.