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Finding the Fourth Proportional to 512.78, 707.27 and 316.35

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Solution

The fourth proportional to 512.78, 707.27 and 316.35 is: 436.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.78 : 707.27 = 316.35 : x
  2. Step 2: Convert to fraction form
    512.78/707.27 = 316.35/x
  3. Step 3: Cross multiply
    512.78x = 707.27 × 316.35
  4. Step 4: Simplify right side
    512.78x = 223,743.28
  5. Step 5: Solve for x
    x = 223,743.28/512.78
  6. Step 6: Final answer
    x = 436.34

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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.