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Finding the Fourth Proportional to 852.64, 1,279.23 and 647.44

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Solution

The fourth proportional to 852.64, 1,279.23 and 647.44 is: 971.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.64 : 1,279.23 = 647.44 : x
  2. Step 2: Convert to fraction form
    852.64/1,279.23 = 647.44/x
  3. Step 3: Cross multiply
    852.64x = 1,279.23 × 647.44
  4. Step 4: Simplify right side
    852.64x = 828,224.67
  5. Step 5: Solve for x
    x = 828,224.67/852.64
  6. Step 6: Final answer
    x = 971.37

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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.