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Finding the Fourth Proportional to 666.96, 1,000.20 and 405.96

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Solution

The fourth proportional to 666.96, 1,000.20 and 405.96 is: 608.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.96 : 1,000.20 = 405.96 : x
  2. Step 2: Convert to fraction form
    666.96/1,000.20 = 405.96/x
  3. Step 3: Cross multiply
    666.96x = 1,000.20 × 405.96
  4. Step 4: Simplify right side
    666.96x = 406,041.19
  5. Step 5: Solve for x
    x = 406,041.19/666.96
  6. Step 6: Final answer
    x = 608.79

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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.