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Finding the Fourth Proportional to 1,388.08, 2,082.42 and 522.39

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Solution

The fourth proportional to 1,388.08, 2,082.42 and 522.39 is: 783.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.08 : 2,082.42 = 522.39 : x
  2. Step 2: Convert to fraction form
    1,388.08/2,082.42 = 522.39/x
  3. Step 3: Cross multiply
    1,388.08x = 2,082.42 × 522.39
  4. Step 4: Simplify right side
    1,388.08x = 1,087,835.38
  5. Step 5: Solve for x
    x = 1,087,835.38/1,388.08
  6. Step 6: Final answer
    x = 783.70

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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.