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Finding the Fourth Proportional to 1,389, 1,916.99 and 799.53

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Solution

The fourth proportional to 1,389, 1,916.99 and 799.53 is: 1,103.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389 : 1,916.99 = 799.53 : x
  2. Step 2: Convert to fraction form
    1,389/1,916.99 = 799.53/x
  3. Step 3: Cross multiply
    1,389x = 1,916.99 × 799.53
  4. Step 4: Simplify right side
    1,389x = 1,532,691.01
  5. Step 5: Solve for x
    x = 1,532,691.01/1,389
  6. Step 6: Final answer
    x = 1,103.45

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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.