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Finding the Fourth Proportional to 1,388.11, 1,916.49 and 890.95

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Solution

The fourth proportional to 1,388.11, 1,916.49 and 890.95 is: 1,230.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.11 : 1,916.49 = 890.95 : x
  2. Step 2: Convert to fraction form
    1,388.11/1,916.49 = 890.95/x
  3. Step 3: Cross multiply
    1,388.11x = 1,916.49 × 890.95
  4. Step 4: Simplify right side
    1,388.11x = 1,707,496.77
  5. Step 5: Solve for x
    x = 1,707,496.77/1,388.11
  6. Step 6: Final answer
    x = 1,230.09

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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.