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Finding the Fourth Proportional to 611.91, 916.63 and 282.39

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Solution

The fourth proportional to 611.91, 916.63 and 282.39 is: 423.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.91 : 916.63 = 282.39 : x
  2. Step 2: Convert to fraction form
    611.91/916.63 = 282.39/x
  3. Step 3: Cross multiply
    611.91x = 916.63 × 282.39
  4. Step 4: Simplify right side
    611.91x = 258,847.15
  5. Step 5: Solve for x
    x = 258,847.15/611.91
  6. Step 6: Final answer
    x = 423.02

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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.