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Finding the Fourth Proportional to 999.15, 1,498.56 and 451.21

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Solution

The fourth proportional to 999.15, 1,498.56 and 451.21 is: 676.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.15 : 1,498.56 = 451.21 : x
  2. Step 2: Convert to fraction form
    999.15/1,498.56 = 451.21/x
  3. Step 3: Cross multiply
    999.15x = 1,498.56 × 451.21
  4. Step 4: Simplify right side
    999.15x = 676,155.51
  5. Step 5: Solve for x
    x = 676,155.51/999.15
  6. Step 6: Final answer
    x = 676.73

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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.