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Finding the Fourth Proportional to 883.24, 1,218.95 and 490.30

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Solution

The fourth proportional to 883.24, 1,218.95 and 490.30 is: 676.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.24 : 1,218.95 = 490.30 : x
  2. Step 2: Convert to fraction form
    883.24/1,218.95 = 490.30/x
  3. Step 3: Cross multiply
    883.24x = 1,218.95 × 490.30
  4. Step 4: Simplify right side
    883.24x = 597,648.73
  5. Step 5: Solve for x
    x = 597,648.73/883.24
  6. Step 6: Final answer
    x = 676.65

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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.