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Finding the Fourth Proportional to 903.89, 1,249.49 and 644.15

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Solution

The fourth proportional to 903.89, 1,249.49 and 644.15 is: 890.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.89 : 1,249.49 = 644.15 : x
  2. Step 2: Convert to fraction form
    903.89/1,249.49 = 644.15/x
  3. Step 3: Cross multiply
    903.89x = 1,249.49 × 644.15
  4. Step 4: Simplify right side
    903.89x = 804,858.98
  5. Step 5: Solve for x
    x = 804,858.98/903.89
  6. Step 6: Final answer
    x = 890.44

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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.