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Finding the Fourth Proportional to 511.78, 706.29 and 315.52

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Solution

The fourth proportional to 511.78, 706.29 and 315.52 is: 435.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.78 : 706.29 = 315.52 : x
  2. Step 2: Convert to fraction form
    511.78/706.29 = 315.52/x
  3. Step 3: Cross multiply
    511.78x = 706.29 × 315.52
  4. Step 4: Simplify right side
    511.78x = 222,848.62
  5. Step 5: Solve for x
    x = 222,848.62/511.78
  6. Step 6: Final answer
    x = 435.44

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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.