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Finding the Fourth Proportional to 1,085.68, 1,624.92 and 787.96

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Solution

The fourth proportional to 1,085.68, 1,624.92 and 787.96 is: 1,179.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.68 : 1,624.92 = 787.96 : x
  2. Step 2: Convert to fraction form
    1,085.68/1,624.92 = 787.96/x
  3. Step 3: Cross multiply
    1,085.68x = 1,624.92 × 787.96
  4. Step 4: Simplify right side
    1,085.68x = 1,280,371.96
  5. Step 5: Solve for x
    x = 1,280,371.96/1,085.68
  6. Step 6: Final answer
    x = 1,179.33

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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.