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Finding the Fourth Proportional to 808.68, 1,220.07 and 768.18

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Solution

The fourth proportional to 808.68, 1,220.07 and 768.18 is: 1,158.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.68 : 1,220.07 = 768.18 : x
  2. Step 2: Convert to fraction form
    808.68/1,220.07 = 768.18/x
  3. Step 3: Cross multiply
    808.68x = 1,220.07 × 768.18
  4. Step 4: Simplify right side
    808.68x = 937,233.37
  5. Step 5: Solve for x
    x = 937,233.37/808.68
  6. Step 6: Final answer
    x = 1,158.97

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Double scale
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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.