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Finding the Fourth Proportional to 852.45, 1,276.87 and 390.61

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Solution

The fourth proportional to 852.45, 1,276.87 and 390.61 is: 585.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.45 : 1,276.87 = 390.61 : x
  2. Step 2: Convert to fraction form
    852.45/1,276.87 = 390.61/x
  3. Step 3: Cross multiply
    852.45x = 1,276.87 × 390.61
  4. Step 4: Simplify right side
    852.45x = 498,758.19
  5. Step 5: Solve for x
    x = 498,758.19/852.45
  6. Step 6: Final answer
    x = 585.09

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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.