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Finding the Fourth Proportional to 608.97, 840.74 and 388.11

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Solution

The fourth proportional to 608.97, 840.74 and 388.11 is: 535.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.97 : 840.74 = 388.11 : x
  2. Step 2: Convert to fraction form
    608.97/840.74 = 388.11/x
  3. Step 3: Cross multiply
    608.97x = 840.74 × 388.11
  4. Step 4: Simplify right side
    608.97x = 326,297.66
  5. Step 5: Solve for x
    x = 326,297.66/608.97
  6. Step 6: Final answer
    x = 535.82

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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.