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Finding the Fourth Proportional to 1,389.51, 2,083.23 and 658.67

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Solution

The fourth proportional to 1,389.51, 2,083.23 and 658.67 is: 987.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.51 : 2,083.23 = 658.67 : x
  2. Step 2: Convert to fraction form
    1,389.51/2,083.23 = 658.67/x
  3. Step 3: Cross multiply
    1,389.51x = 2,083.23 × 658.67
  4. Step 4: Simplify right side
    1,389.51x = 1,372,150.69
  5. Step 5: Solve for x
    x = 1,372,150.69/1,389.51
  6. Step 6: Final answer
    x = 987.51

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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.