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Finding the Fourth Proportional to 1,438.42, 2,156.94 and 658.18

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Solution

The fourth proportional to 1,438.42, 2,156.94 and 658.18 is: 986.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.42 : 2,156.94 = 658.18 : x
  2. Step 2: Convert to fraction form
    1,438.42/2,156.94 = 658.18/x
  3. Step 3: Cross multiply
    1,438.42x = 2,156.94 × 658.18
  4. Step 4: Simplify right side
    1,438.42x = 1,419,654.77
  5. Step 5: Solve for x
    x = 1,419,654.77/1,438.42
  6. Step 6: Final answer
    x = 986.95

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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.