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Finding the Fourth Proportional to 809.40, 1,116.57 and 698.85

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Solution

The fourth proportional to 809.40, 1,116.57 and 698.85 is: 964.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.40 : 1,116.57 = 698.85 : x
  2. Step 2: Convert to fraction form
    809.40/1,116.57 = 698.85/x
  3. Step 3: Cross multiply
    809.40x = 1,116.57 × 698.85
  4. Step 4: Simplify right side
    809.40x = 780,314.94
  5. Step 5: Solve for x
    x = 780,314.94/809.40
  6. Step 6: Final answer
    x = 964.07

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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.