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Finding the Fourth Proportional to 920.75, 1,381.13 and 236.75

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Solution

The fourth proportional to 920.75, 1,381.13 and 236.75 is: 355.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.75 : 1,381.13 = 236.75 : x
  2. Step 2: Convert to fraction form
    920.75/1,381.13 = 236.75/x
  3. Step 3: Cross multiply
    920.75x = 1,381.13 × 236.75
  4. Step 4: Simplify right side
    920.75x = 326,982.53
  5. Step 5: Solve for x
    x = 326,982.53/920.75
  6. Step 6: Final answer
    x = 355.13

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Double scale
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Similar ratio
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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.