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Finding the Fourth Proportional to 852.80, 1,279.20 and 847.40

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Solution

The fourth proportional to 852.80, 1,279.20 and 847.40 is: 1,271.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.80 : 1,279.20 = 847.40 : x
  2. Step 2: Convert to fraction form
    852.80/1,279.20 = 847.40/x
  3. Step 3: Cross multiply
    852.80x = 1,279.20 × 847.40
  4. Step 4: Simplify right side
    852.80x = 1,083,994.08
  5. Step 5: Solve for x
    x = 1,083,994.08/852.80
  6. Step 6: Final answer
    x = 1,271.10

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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.