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Finding the Fourth Proportional to 609.39, 840.91 and 347.41

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Solution

The fourth proportional to 609.39, 840.91 and 347.41 is: 479.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.39 : 840.91 = 347.41 : x
  2. Step 2: Convert to fraction form
    609.39/840.91 = 347.41/x
  3. Step 3: Cross multiply
    609.39x = 840.91 × 347.41
  4. Step 4: Simplify right side
    609.39x = 292,140.54
  5. Step 5: Solve for x
    x = 292,140.54/609.39
  6. Step 6: Final answer
    x = 479.40

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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.