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Finding the Fourth Proportional to 611.21, 916.91 and 286.58

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Solution

The fourth proportional to 611.21, 916.91 and 286.58 is: 429.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.21 : 916.91 = 286.58 : x
  2. Step 2: Convert to fraction form
    611.21/916.91 = 286.58/x
  3. Step 3: Cross multiply
    611.21x = 916.91 × 286.58
  4. Step 4: Simplify right side
    611.21x = 262,762.05
  5. Step 5: Solve for x
    x = 262,762.05/611.21
  6. Step 6: Final answer
    x = 429.91

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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.