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Finding the Fourth Proportional to 1,389.75, 2,084.01 and 609.31

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Solution

The fourth proportional to 1,389.75, 2,084.01 and 609.31 is: 913.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.75 : 2,084.01 = 609.31 : x
  2. Step 2: Convert to fraction form
    1,389.75/2,084.01 = 609.31/x
  3. Step 3: Cross multiply
    1,389.75x = 2,084.01 × 609.31
  4. Step 4: Simplify right side
    1,389.75x = 1,269,808.13
  5. Step 5: Solve for x
    x = 1,269,808.13/1,389.75
  6. Step 6: Final answer
    x = 913.70

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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.