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Finding the Fourth Proportional to 609.31, 840.85 and 347.38

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Solution

The fourth proportional to 609.31, 840.85 and 347.38 is: 479.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.31 : 840.85 = 347.38 : x
  2. Step 2: Convert to fraction form
    609.31/840.85 = 347.38/x
  3. Step 3: Cross multiply
    609.31x = 840.85 × 347.38
  4. Step 4: Simplify right side
    609.31x = 292,093.86
  5. Step 5: Solve for x
    x = 292,093.86/609.31
  6. Step 6: Final answer
    x = 479.38

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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.