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Finding the Fourth Proportional to 342.88, 513.40 and 205.28

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Solution

The fourth proportional to 342.88, 513.40 and 205.28 is: 307.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.88 : 513.40 = 205.28 : x
  2. Step 2: Convert to fraction form
    342.88/513.40 = 205.28/x
  3. Step 3: Cross multiply
    342.88x = 513.40 × 205.28
  4. Step 4: Simplify right side
    342.88x = 105,390.75
  5. Step 5: Solve for x
    x = 105,390.75/342.88
  6. Step 6: Final answer
    x = 307.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.