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Finding the Fourth Proportional to 809.21, 1,116.70 and 459.90

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Solution

The fourth proportional to 809.21, 1,116.70 and 459.90 is: 634.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.21 : 1,116.70 = 459.90 : x
  2. Step 2: Convert to fraction form
    809.21/1,116.70 = 459.90/x
  3. Step 3: Cross multiply
    809.21x = 1,116.70 × 459.90
  4. Step 4: Simplify right side
    809.21x = 513,564.75
  5. Step 5: Solve for x
    x = 513,564.75/809.21
  6. Step 6: Final answer
    x = 634.65

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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.