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Finding the Fourth Proportional to 906.91, 1,251.53 and 492.91

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Solution

The fourth proportional to 906.91, 1,251.53 and 492.91 is: 680.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.91 : 1,251.53 = 492.91 : x
  2. Step 2: Convert to fraction form
    906.91/1,251.53 = 492.91/x
  3. Step 3: Cross multiply
    906.91x = 1,251.53 × 492.91
  4. Step 4: Simplify right side
    906.91x = 616,891.65
  5. Step 5: Solve for x
    x = 616,891.65/906.91
  6. Step 6: Final answer
    x = 680.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.