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Finding the Fourth Proportional to 999.66, 1,498.20 and 691.02

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Solution

The fourth proportional to 999.66, 1,498.20 and 691.02 is: 1,035.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.66 : 1,498.20 = 691.02 : x
  2. Step 2: Convert to fraction form
    999.66/1,498.20 = 691.02/x
  3. Step 3: Cross multiply
    999.66x = 1,498.20 × 691.02
  4. Step 4: Simplify right side
    999.66x = 1,035,286.16
  5. Step 5: Solve for x
    x = 1,035,286.16/999.66
  6. Step 6: Final answer
    x = 1,035.64

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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.