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Finding the Fourth Proportional to 512.21, 706.88 and 315.84

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Solution

The fourth proportional to 512.21, 706.88 and 315.84 is: 435.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.21 : 706.88 = 315.84 : x
  2. Step 2: Convert to fraction form
    512.21/706.88 = 315.84/x
  3. Step 3: Cross multiply
    512.21x = 706.88 × 315.84
  4. Step 4: Simplify right side
    512.21x = 223,259.40
  5. Step 5: Solve for x
    x = 223,259.40/512.21
  6. Step 6: Final answer
    x = 435.87

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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.