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Finding the Fourth Proportional to 809.43, 1,116.93 and 494.85

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Solution

The fourth proportional to 809.43, 1,116.93 and 494.85 is: 682.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.43 : 1,116.93 = 494.85 : x
  2. Step 2: Convert to fraction form
    809.43/1,116.93 = 494.85/x
  3. Step 3: Cross multiply
    809.43x = 1,116.93 × 494.85
  4. Step 4: Simplify right side
    809.43x = 552,712.81
  5. Step 5: Solve for x
    x = 552,712.81/809.43
  6. Step 6: Final answer
    x = 682.84

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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.