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Finding the Fourth Proportional to 883.20, 1,218.87 and 490.22

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Solution

The fourth proportional to 883.20, 1,218.87 and 490.22 is: 676.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.20 : 1,218.87 = 490.22 : x
  2. Step 2: Convert to fraction form
    883.20/1,218.87 = 490.22/x
  3. Step 3: Cross multiply
    883.20x = 1,218.87 × 490.22
  4. Step 4: Simplify right side
    883.20x = 597,518.72
  5. Step 5: Solve for x
    x = 597,518.72/883.20
  6. Step 6: Final answer
    x = 676.54

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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.