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Finding the Fourth Proportional to 852.94, 1,279.02 and 390.87

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Solution

The fourth proportional to 852.94, 1,279.02 and 390.87 is: 586.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.94 : 1,279.02 = 390.87 : x
  2. Step 2: Convert to fraction form
    852.94/1,279.02 = 390.87/x
  3. Step 3: Cross multiply
    852.94x = 1,279.02 × 390.87
  4. Step 4: Simplify right side
    852.94x = 499,924.15
  5. Step 5: Solve for x
    x = 499,924.15/852.94
  6. Step 6: Final answer
    x = 586.12

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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.