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Finding the Fourth Proportional to 1,388.46, 1,916.07 and 798.99

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Solution

The fourth proportional to 1,388.46, 1,916.07 and 798.99 is: 1,102.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.46 : 1,916.07 = 798.99 : x
  2. Step 2: Convert to fraction form
    1,388.46/1,916.07 = 798.99/x
  3. Step 3: Cross multiply
    1,388.46x = 1,916.07 × 798.99
  4. Step 4: Simplify right side
    1,388.46x = 1,530,920.77
  5. Step 5: Solve for x
    x = 1,530,920.77/1,388.46
  6. Step 6: Final answer
    x = 1,102.60

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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.