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Finding the Fourth Proportional to 667.56, 999.36 and 406.77

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Solution

The fourth proportional to 667.56, 999.36 and 406.77 is: 608.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.56 : 999.36 = 406.77 : x
  2. Step 2: Convert to fraction form
    667.56/999.36 = 406.77/x
  3. Step 3: Cross multiply
    667.56x = 999.36 × 406.77
  4. Step 4: Simplify right side
    667.56x = 406,509.67
  5. Step 5: Solve for x
    x = 406,509.67/667.56
  6. Step 6: Final answer
    x = 608.95

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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.