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Finding the Fourth Proportional to 1,389.34, 2,084.09 and 523.63

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Solution

The fourth proportional to 1,389.34, 2,084.09 and 523.63 is: 785.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.34 : 2,084.09 = 523.63 : x
  2. Step 2: Convert to fraction form
    1,389.34/2,084.09 = 523.63/x
  3. Step 3: Cross multiply
    1,389.34x = 2,084.09 × 523.63
  4. Step 4: Simplify right side
    1,389.34x = 1,091,292.05
  5. Step 5: Solve for x
    x = 1,091,292.05/1,389.34
  6. Step 6: Final answer
    x = 785.48

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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.