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Finding the Fourth Proportional to 859.99, 1,289.22 and 372.78

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Solution

The fourth proportional to 859.99, 1,289.22 and 372.78 is: 558.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.99 : 1,289.22 = 372.78 : x
  2. Step 2: Convert to fraction form
    859.99/1,289.22 = 372.78/x
  3. Step 3: Cross multiply
    859.99x = 1,289.22 × 372.78
  4. Step 4: Simplify right side
    859.99x = 480,588.99
  5. Step 5: Solve for x
    x = 480,588.99/859.99
  6. Step 6: Final answer
    x = 558.83

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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.