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Finding the Fourth Proportional to 1,438.39, 2,155.71 and 658.26

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Solution

The fourth proportional to 1,438.39, 2,155.71 and 658.26 is: 986.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.39 : 2,155.71 = 658.26 : x
  2. Step 2: Convert to fraction form
    1,438.39/2,155.71 = 658.26/x
  3. Step 3: Cross multiply
    1,438.39x = 2,155.71 × 658.26
  4. Step 4: Simplify right side
    1,438.39x = 1,419,020.13
  5. Step 5: Solve for x
    x = 1,419,020.13/1,438.39
  6. Step 6: Final answer
    x = 986.53

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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.