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Finding the Fourth Proportional to 615.33, 920.91 and 512.79

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Solution

The fourth proportional to 615.33, 920.91 and 512.79 is: 767.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.33 : 920.91 = 512.79 : x
  2. Step 2: Convert to fraction form
    615.33/920.91 = 512.79/x
  3. Step 3: Cross multiply
    615.33x = 920.91 × 512.79
  4. Step 4: Simplify right side
    615.33x = 472,233.44
  5. Step 5: Solve for x
    x = 472,233.44/615.33
  6. Step 6: Final answer
    x = 767.45

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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.