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Finding the Fourth Proportional to 506.87, 699.38 and 388.99

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Solution

The fourth proportional to 506.87, 699.38 and 388.99 is: 536.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.87 : 699.38 = 388.99 : x
  2. Step 2: Convert to fraction form
    506.87/699.38 = 388.99/x
  3. Step 3: Cross multiply
    506.87x = 699.38 × 388.99
  4. Step 4: Simplify right side
    506.87x = 272,050.47
  5. Step 5: Solve for x
    x = 272,050.47/506.87
  6. Step 6: Final answer
    x = 536.72

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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.