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Finding the Fourth Proportional to 852.83, 1,279.42 and 390.63

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Solution

The fourth proportional to 852.83, 1,279.42 and 390.63 is: 586.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.83 : 1,279.42 = 390.63 : x
  2. Step 2: Convert to fraction form
    852.83/1,279.42 = 390.63/x
  3. Step 3: Cross multiply
    852.83x = 1,279.42 × 390.63
  4. Step 4: Simplify right side
    852.83x = 499,774.06
  5. Step 5: Solve for x
    x = 499,774.06/852.83
  6. Step 6: Final answer
    x = 586.02

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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.