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Finding the Fourth Proportional to 809.19, 1,116.59 and 455.09

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Solution

The fourth proportional to 809.19, 1,116.59 and 455.09 is: 627.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.19 : 1,116.59 = 455.09 : x
  2. Step 2: Convert to fraction form
    809.19/1,116.59 = 455.09/x
  3. Step 3: Cross multiply
    809.19x = 1,116.59 × 455.09
  4. Step 4: Simplify right side
    809.19x = 508,141.08
  5. Step 5: Solve for x
    x = 508,141.08/809.19
  6. Step 6: Final answer
    x = 627.96

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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.