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Finding the Fourth Proportional to 1,389.39, 2,084.01 and 511.89

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Solution

The fourth proportional to 1,389.39, 2,084.01 and 511.89 is: 767.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.39 : 2,084.01 = 511.89 : x
  2. Step 2: Convert to fraction form
    1,389.39/2,084.01 = 511.89/x
  3. Step 3: Cross multiply
    1,389.39x = 2,084.01 × 511.89
  4. Step 4: Simplify right side
    1,389.39x = 1,066,783.88
  5. Step 5: Solve for x
    x = 1,066,783.88/1,389.39
  6. Step 6: Final answer
    x = 767.81

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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.