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Finding the Fourth Proportional to 809.19, 1,116.68 and 459.90

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Solution

The fourth proportional to 809.19, 1,116.68 and 459.90 is: 634.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.19 : 1,116.68 = 459.90 : x
  2. Step 2: Convert to fraction form
    809.19/1,116.68 = 459.90/x
  3. Step 3: Cross multiply
    809.19x = 1,116.68 × 459.90
  4. Step 4: Simplify right side
    809.19x = 513,558.83
  5. Step 5: Solve for x
    x = 513,558.83/809.19
  6. Step 6: Final answer
    x = 634.66

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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.