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Finding the Fourth Proportional to 512.80, 706.98 and 442.60

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Solution

The fourth proportional to 512.80, 706.98 and 442.60 is: 610.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.80 : 706.98 = 442.60 : x
  2. Step 2: Convert to fraction form
    512.80/706.98 = 442.60/x
  3. Step 3: Cross multiply
    512.80x = 706.98 × 442.60
  4. Step 4: Simplify right side
    512.80x = 312,909.35
  5. Step 5: Solve for x
    x = 312,909.35/512.80
  6. Step 6: Final answer
    x = 610.20

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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.