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Finding the Fourth Proportional to 906.65, 1,358.89 and 418.66

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Solution

The fourth proportional to 906.65, 1,358.89 and 418.66 is: 627.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.65 : 1,358.89 = 418.66 : x
  2. Step 2: Convert to fraction form
    906.65/1,358.89 = 418.66/x
  3. Step 3: Cross multiply
    906.65x = 1,358.89 × 418.66
  4. Step 4: Simplify right side
    906.65x = 568,912.89
  5. Step 5: Solve for x
    x = 568,912.89/906.65
  6. Step 6: Final answer
    x = 627.49

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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.