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Finding the Fourth Proportional to 809.16, 1,221.57 and 804.84

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Solution

The fourth proportional to 809.16, 1,221.57 and 804.84 is: 1,215.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.16 : 1,221.57 = 804.84 : x
  2. Step 2: Convert to fraction form
    809.16/1,221.57 = 804.84/x
  3. Step 3: Cross multiply
    809.16x = 1,221.57 × 804.84
  4. Step 4: Simplify right side
    809.16x = 983,168.40
  5. Step 5: Solve for x
    x = 983,168.40/809.16
  6. Step 6: Final answer
    x = 1,215.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.