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Finding the Fourth Proportional to 683.14, 942.75 and 388.38

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Solution

The fourth proportional to 683.14, 942.75 and 388.38 is: 535.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.14 : 942.75 = 388.38 : x
  2. Step 2: Convert to fraction form
    683.14/942.75 = 388.38/x
  3. Step 3: Cross multiply
    683.14x = 942.75 × 388.38
  4. Step 4: Simplify right side
    683.14x = 366,143.30
  5. Step 5: Solve for x
    x = 366,143.30/683.14
  6. Step 6: Final answer
    x = 535.98

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Half scale
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Double scale
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1.5x scale

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.