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Finding the Fourth Proportional to 841.96, 1,261.26 and 668.92

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Solution

The fourth proportional to 841.96, 1,261.26 and 668.92 is: 1,002.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.96 : 1,261.26 = 668.92 : x
  2. Step 2: Convert to fraction form
    841.96/1,261.26 = 668.92/x
  3. Step 3: Cross multiply
    841.96x = 1,261.26 × 668.92
  4. Step 4: Simplify right side
    841.96x = 843,682.04
  5. Step 5: Solve for x
    x = 843,682.04/841.96
  6. Step 6: Final answer
    x = 1,002.05

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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.