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Finding the Fourth Proportional to 1,095.52, 1,641.12 and 821.92

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Solution

The fourth proportional to 1,095.52, 1,641.12 and 821.92 is: 1,231.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,095.52 : 1,641.12 = 821.92 : x
  2. Step 2: Convert to fraction form
    1,095.52/1,641.12 = 821.92/x
  3. Step 3: Cross multiply
    1,095.52x = 1,641.12 × 821.92
  4. Step 4: Simplify right side
    1,095.52x = 1,348,869.35
  5. Step 5: Solve for x
    x = 1,348,869.35/1,095.52
  6. Step 6: Final answer
    x = 1,231.26

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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.