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Finding the Fourth Proportional to 809.19, 1,116.30 and 494.20

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Solution

The fourth proportional to 809.19, 1,116.30 and 494.20 is: 681.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.19 : 1,116.30 = 494.20 : x
  2. Step 2: Convert to fraction form
    809.19/1,116.30 = 494.20/x
  3. Step 3: Cross multiply
    809.19x = 1,116.30 × 494.20
  4. Step 4: Simplify right side
    809.19x = 551,675.46
  5. Step 5: Solve for x
    x = 551,675.46/809.19
  6. Step 6: Final answer
    x = 681.76

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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.