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Finding the Fourth Proportional to 1,389.94, 2,083.11 and 659.74

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Solution

The fourth proportional to 1,389.94, 2,083.11 and 659.74 is: 988.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.94 : 2,083.11 = 659.74 : x
  2. Step 2: Convert to fraction form
    1,389.94/2,083.11 = 659.74/x
  3. Step 3: Cross multiply
    1,389.94x = 2,083.11 × 659.74
  4. Step 4: Simplify right side
    1,389.94x = 1,374,310.99
  5. Step 5: Solve for x
    x = 1,374,310.99/1,389.94
  6. Step 6: Final answer
    x = 988.76

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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.