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Finding the Fourth Proportional to 1,219.24, 1,827.42 and 641.80

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Solution

The fourth proportional to 1,219.24, 1,827.42 and 641.80 is: 961.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.24 : 1,827.42 = 641.80 : x
  2. Step 2: Convert to fraction form
    1,219.24/1,827.42 = 641.80/x
  3. Step 3: Cross multiply
    1,219.24x = 1,827.42 × 641.80
  4. Step 4: Simplify right side
    1,219.24x = 1,172,838.16
  5. Step 5: Solve for x
    x = 1,172,838.16/1,219.24
  6. Step 6: Final answer
    x = 961.94

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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.