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Finding the Fourth Proportional to 852.78, 1,278.98 and 414.02

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Solution

The fourth proportional to 852.78, 1,278.98 and 414.02 is: 620.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.78 : 1,278.98 = 414.02 : x
  2. Step 2: Convert to fraction form
    852.78/1,278.98 = 414.02/x
  3. Step 3: Cross multiply
    852.78x = 1,278.98 × 414.02
  4. Step 4: Simplify right side
    852.78x = 529,514.83
  5. Step 5: Solve for x
    x = 529,514.83/852.78
  6. Step 6: Final answer
    x = 620.93

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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.