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Finding the Fourth Proportional to 609.89, 841.38 and 388.76

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Solution

The fourth proportional to 609.89, 841.38 and 388.76 is: 536.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.89 : 841.38 = 388.76 : x
  2. Step 2: Convert to fraction form
    609.89/841.38 = 388.76/x
  3. Step 3: Cross multiply
    609.89x = 841.38 × 388.76
  4. Step 4: Simplify right side
    609.89x = 327,090.68
  5. Step 5: Solve for x
    x = 327,090.68/609.89
  6. Step 6: Final answer
    x = 536.32

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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.