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Finding the Fourth Proportional to 999.12, 1,491.04 and 889.77

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Solution

The fourth proportional to 999.12, 1,491.04 and 889.77 is: 1,327.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.12 : 1,491.04 = 889.77 : x
  2. Step 2: Convert to fraction form
    999.12/1,491.04 = 889.77/x
  3. Step 3: Cross multiply
    999.12x = 1,491.04 × 889.77
  4. Step 4: Simplify right side
    999.12x = 1,326,677.43
  5. Step 5: Solve for x
    x = 1,326,677.43/999.12
  6. Step 6: Final answer
    x = 1,327.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.