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Finding the Fourth Proportional to 1,890.85, 2,836.58 and 658.61

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Solution

The fourth proportional to 1,890.85, 2,836.58 and 658.61 is: 988.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.85 : 2,836.58 = 658.61 : x
  2. Step 2: Convert to fraction form
    1,890.85/2,836.58 = 658.61/x
  3. Step 3: Cross multiply
    1,890.85x = 2,836.58 × 658.61
  4. Step 4: Simplify right side
    1,890.85x = 1,868,199.95
  5. Step 5: Solve for x
    x = 1,868,199.95/1,890.85
  6. Step 6: Final answer
    x = 988.02

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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.