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Finding the Fourth Proportional to 512.77, 707.36 and 388.21

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Solution

The fourth proportional to 512.77, 707.36 and 388.21 is: 535.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.77 : 707.36 = 388.21 : x
  2. Step 2: Convert to fraction form
    512.77/707.36 = 388.21/x
  3. Step 3: Cross multiply
    512.77x = 707.36 × 388.21
  4. Step 4: Simplify right side
    512.77x = 274,604.23
  5. Step 5: Solve for x
    x = 274,604.23/512.77
  6. Step 6: Final answer
    x = 535.53

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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.