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Finding the Fourth Proportional to 506.39, 699.16 and 388.15

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Solution

The fourth proportional to 506.39, 699.16 and 388.15 is: 535.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.39 : 699.16 = 388.15 : x
  2. Step 2: Convert to fraction form
    506.39/699.16 = 388.15/x
  3. Step 3: Cross multiply
    506.39x = 699.16 × 388.15
  4. Step 4: Simplify right side
    506.39x = 271,377.01
  5. Step 5: Solve for x
    x = 271,377.01/506.39
  6. Step 6: Final answer
    x = 535.91

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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.