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Finding the Fourth Proportional to 1,429.96, 2,145.66 and 661

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Solution

The fourth proportional to 1,429.96, 2,145.66 and 661 is: 991.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.96 : 2,145.66 = 661 : x
  2. Step 2: Convert to fraction form
    1,429.96/2,145.66 = 661/x
  3. Step 3: Cross multiply
    1,429.96x = 2,145.66 × 661
  4. Step 4: Simplify right side
    1,429.96x = 1,418,281.26
  5. Step 5: Solve for x
    x = 1,418,281.26/1,429.96
  6. Step 6: Final answer
    x = 991.83

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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.