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Finding the Fourth Proportional to 961.22, 1,325.57 and 890.48

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Solution

The fourth proportional to 961.22, 1,325.57 and 890.48 is: 1,228.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.22 : 1,325.57 = 890.48 : x
  2. Step 2: Convert to fraction form
    961.22/1,325.57 = 890.48/x
  3. Step 3: Cross multiply
    961.22x = 1,325.57 × 890.48
  4. Step 4: Simplify right side
    961.22x = 1,180,384.98
  5. Step 5: Solve for x
    x = 1,180,384.98/961.22
  6. Step 6: Final answer
    x = 1,228.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.