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Finding the Fourth Proportional to 847.58, 1,271.77 and 665.33

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Solution

The fourth proportional to 847.58, 1,271.77 and 665.33 is: 998.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.58 : 1,271.77 = 665.33 : x
  2. Step 2: Convert to fraction form
    847.58/1,271.77 = 665.33/x
  3. Step 3: Cross multiply
    847.58x = 1,271.77 × 665.33
  4. Step 4: Simplify right side
    847.58x = 846,138.71
  5. Step 5: Solve for x
    x = 846,138.71/847.58
  6. Step 6: Final answer
    x = 998.31

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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.