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Finding the Fourth Proportional to 999.39, 1,499.10 and 451.19

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Solution

The fourth proportional to 999.39, 1,499.10 and 451.19 is: 676.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.39 : 1,499.10 = 451.19 : x
  2. Step 2: Convert to fraction form
    999.39/1,499.10 = 451.19/x
  3. Step 3: Cross multiply
    999.39x = 1,499.10 × 451.19
  4. Step 4: Simplify right side
    999.39x = 676,378.93
  5. Step 5: Solve for x
    x = 676,378.93/999.39
  6. Step 6: Final answer
    x = 676.79

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Double scale
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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.