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Finding the Fourth Proportional to 852.80, 1,269.69 and 840.64

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Solution

The fourth proportional to 852.80, 1,269.69 and 840.64 is: 1,251.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.80 : 1,269.69 = 840.64 : x
  2. Step 2: Convert to fraction form
    852.80/1,269.69 = 840.64/x
  3. Step 3: Cross multiply
    852.80x = 1,269.69 × 840.64
  4. Step 4: Simplify right side
    852.80x = 1,067,352.20
  5. Step 5: Solve for x
    x = 1,067,352.20/852.80
  6. Step 6: Final answer
    x = 1,251.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.