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Finding the Fourth Proportional to 609.28, 840.60 and 388.28

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Solution

The fourth proportional to 609.28, 840.60 and 388.28 is: 535.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.28 : 840.60 = 388.28 : x
  2. Step 2: Convert to fraction form
    609.28/840.60 = 388.28/x
  3. Step 3: Cross multiply
    609.28x = 840.60 × 388.28
  4. Step 4: Simplify right side
    609.28x = 326,390.27
  5. Step 5: Solve for x
    x = 326,390.27/609.28
  6. Step 6: Final answer
    x = 535.70

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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.