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Finding the Fourth Proportional to 513.55, 707.76 and 388.54

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Solution

The fourth proportional to 513.55, 707.76 and 388.54 is: 535.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.55 : 707.76 = 388.54 : x
  2. Step 2: Convert to fraction form
    513.55/707.76 = 388.54/x
  3. Step 3: Cross multiply
    513.55x = 707.76 × 388.54
  4. Step 4: Simplify right side
    513.55x = 274,993.07
  5. Step 5: Solve for x
    x = 274,993.07/513.55
  6. Step 6: Final answer
    x = 535.47

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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.