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Finding the Fourth Proportional to 808.51, 1,212.94 and 443.11

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Solution

The fourth proportional to 808.51, 1,212.94 and 443.11 is: 664.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.51 : 1,212.94 = 443.11 : x
  2. Step 2: Convert to fraction form
    808.51/1,212.94 = 443.11/x
  3. Step 3: Cross multiply
    808.51x = 1,212.94 × 443.11
  4. Step 4: Simplify right side
    808.51x = 537,459.78
  5. Step 5: Solve for x
    x = 537,459.78/808.51
  6. Step 6: Final answer
    x = 664.76

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.