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Finding the Fourth Proportional to 1,309, 1,961.34 and 658.84

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Solution

The fourth proportional to 1,309, 1,961.34 and 658.84 is: 987.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309 : 1,961.34 = 658.84 : x
  2. Step 2: Convert to fraction form
    1,309/1,961.34 = 658.84/x
  3. Step 3: Cross multiply
    1,309x = 1,961.34 × 658.84
  4. Step 4: Simplify right side
    1,309x = 1,292,209.25
  5. Step 5: Solve for x
    x = 1,292,209.25/1,309
  6. Step 6: Final answer
    x = 987.17

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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.