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Finding the Fourth Proportional to 999.08, 1,379.28 and 626.42

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Solution

The fourth proportional to 999.08, 1,379.28 and 626.42 is: 864.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.08 : 1,379.28 = 626.42 : x
  2. Step 2: Convert to fraction form
    999.08/1,379.28 = 626.42/x
  3. Step 3: Cross multiply
    999.08x = 1,379.28 × 626.42
  4. Step 4: Simplify right side
    999.08x = 864,008.58
  5. Step 5: Solve for x
    x = 864,008.58/999.08
  6. Step 6: Final answer
    x = 864.80

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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.