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Finding the Fourth Proportional to 608.85, 840.33 and 388.05

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Solution

The fourth proportional to 608.85, 840.33 and 388.05 is: 535.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.85 : 840.33 = 388.05 : x
  2. Step 2: Convert to fraction form
    608.85/840.33 = 388.05/x
  3. Step 3: Cross multiply
    608.85x = 840.33 × 388.05
  4. Step 4: Simplify right side
    608.85x = 326,090.06
  5. Step 5: Solve for x
    x = 326,090.06/608.85
  6. Step 6: Final answer
    x = 535.58

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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.