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Finding the Fourth Proportional to 511.90, 706.46 and 315.42

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Solution

The fourth proportional to 511.90, 706.46 and 315.42 is: 435.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.90 : 706.46 = 315.42 : x
  2. Step 2: Convert to fraction form
    511.90/706.46 = 315.42/x
  3. Step 3: Cross multiply
    511.90x = 706.46 × 315.42
  4. Step 4: Simplify right side
    511.90x = 222,831.36
  5. Step 5: Solve for x
    x = 222,831.36/511.90
  6. Step 6: Final answer
    x = 435.30

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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.