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Finding the Fourth Proportional to 859.99, 1,290.66 and 449.32

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Solution

The fourth proportional to 859.99, 1,290.66 and 449.32 is: 674.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.99 : 1,290.66 = 449.32 : x
  2. Step 2: Convert to fraction form
    859.99/1,290.66 = 449.32/x
  3. Step 3: Cross multiply
    859.99x = 1,290.66 × 449.32
  4. Step 4: Simplify right side
    859.99x = 579,919.35
  5. Step 5: Solve for x
    x = 579,919.35/859.99
  6. Step 6: Final answer
    x = 674.33

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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.