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Finding the Fourth Proportional to 999.46, 1,379.46 and 667.63

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Solution

The fourth proportional to 999.46, 1,379.46 and 667.63 is: 921.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.46 : 1,379.46 = 667.63 : x
  2. Step 2: Convert to fraction form
    999.46/1,379.46 = 667.63/x
  3. Step 3: Cross multiply
    999.46x = 1,379.46 × 667.63
  4. Step 4: Simplify right side
    999.46x = 920,968.88
  5. Step 5: Solve for x
    x = 920,968.88/999.46
  6. Step 6: Final answer
    x = 921.47

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1.5x scale

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.