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Finding the Fourth Proportional to 666.66, 1,000.60 and 512.09

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Solution

The fourth proportional to 666.66, 1,000.60 and 512.09 is: 768.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.66 : 1,000.60 = 512.09 : x
  2. Step 2: Convert to fraction form
    666.66/1,000.60 = 512.09/x
  3. Step 3: Cross multiply
    666.66x = 1,000.60 × 512.09
  4. Step 4: Simplify right side
    666.66x = 512,397.25
  5. Step 5: Solve for x
    x = 512,397.25/666.66
  6. Step 6: Final answer
    x = 768.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.