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Finding the Fourth Proportional to 852.35, 1,278.36 and 390.02

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Solution

The fourth proportional to 852.35, 1,278.36 and 390.02 is: 584.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.35 : 1,278.36 = 390.02 : x
  2. Step 2: Convert to fraction form
    852.35/1,278.36 = 390.02/x
  3. Step 3: Cross multiply
    852.35x = 1,278.36 × 390.02
  4. Step 4: Simplify right side
    852.35x = 498,579.58
  5. Step 5: Solve for x
    x = 498,579.58/852.35
  6. Step 6: Final answer
    x = 584.95

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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.