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Finding the Fourth Proportional to 859.29, 1,288.63 and 303.85

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Solution

The fourth proportional to 859.29, 1,288.63 and 303.85 is: 455.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.29 : 1,288.63 = 303.85 : x
  2. Step 2: Convert to fraction form
    859.29/1,288.63 = 303.85/x
  3. Step 3: Cross multiply
    859.29x = 1,288.63 × 303.85
  4. Step 4: Simplify right side
    859.29x = 391,550.23
  5. Step 5: Solve for x
    x = 391,550.23/859.29
  6. Step 6: Final answer
    x = 455.67

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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.