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Finding the Fourth Proportional to 905.16, 1,249.10 and 639.33

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Solution

The fourth proportional to 905.16, 1,249.10 and 639.33 is: 882.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.16 : 1,249.10 = 639.33 : x
  2. Step 2: Convert to fraction form
    905.16/1,249.10 = 639.33/x
  3. Step 3: Cross multiply
    905.16x = 1,249.10 × 639.33
  4. Step 4: Simplify right side
    905.16x = 798,583.91
  5. Step 5: Solve for x
    x = 798,583.91/905.16
  6. Step 6: Final answer
    x = 882.26

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Double scale
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1.5x scale

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.