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Finding the Fourth Proportional to 883.19, 1,218.74 and 490.21

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Solution

The fourth proportional to 883.19, 1,218.74 and 490.21 is: 676.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.19 : 1,218.74 = 490.21 : x
  2. Step 2: Convert to fraction form
    883.19/1,218.74 = 490.21/x
  3. Step 3: Cross multiply
    883.19x = 1,218.74 × 490.21
  4. Step 4: Simplify right side
    883.19x = 597,433.04
  5. Step 5: Solve for x
    x = 597,433.04/883.19
  6. Step 6: Final answer
    x = 676.45

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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.