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Finding the Fourth Proportional to 506.07, 698.28 and 388.20

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Solution

The fourth proportional to 506.07, 698.28 and 388.20 is: 535.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.07 : 698.28 = 388.20 : x
  2. Step 2: Convert to fraction form
    506.07/698.28 = 388.20/x
  3. Step 3: Cross multiply
    506.07x = 698.28 × 388.20
  4. Step 4: Simplify right side
    506.07x = 271,072.30
  5. Step 5: Solve for x
    x = 271,072.30/506.07
  6. Step 6: Final answer
    x = 535.64

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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.