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Finding the Fourth Proportional to 609.36, 840.76 and 388.63

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Solution

The fourth proportional to 609.36, 840.76 and 388.63 is: 536.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.36 : 840.76 = 388.63 : x
  2. Step 2: Convert to fraction form
    609.36/840.76 = 388.63/x
  3. Step 3: Cross multiply
    609.36x = 840.76 × 388.63
  4. Step 4: Simplify right side
    609.36x = 326,744.56
  5. Step 5: Solve for x
    x = 326,744.56/609.36
  6. Step 6: Final answer
    x = 536.21

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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.