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Finding the Fourth Proportional to 1,389.24, 2,084.89 and 658.82

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Solution

The fourth proportional to 1,389.24, 2,084.89 and 658.82 is: 988.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.24 : 2,084.89 = 658.82 : x
  2. Step 2: Convert to fraction form
    1,389.24/2,084.89 = 658.82/x
  3. Step 3: Cross multiply
    1,389.24x = 2,084.89 × 658.82
  4. Step 4: Simplify right side
    1,389.24x = 1,373,567.23
  5. Step 5: Solve for x
    x = 1,373,567.23/1,389.24
  6. Step 6: Final answer
    x = 988.72

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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.