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Finding the Fourth Proportional to 1,308.64, 1,961.07 and 658.48

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Solution

The fourth proportional to 1,308.64, 1,961.07 and 658.48 is: 986.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.64 : 1,961.07 = 658.48 : x
  2. Step 2: Convert to fraction form
    1,308.64/1,961.07 = 658.48/x
  3. Step 3: Cross multiply
    1,308.64x = 1,961.07 × 658.48
  4. Step 4: Simplify right side
    1,308.64x = 1,291,325.37
  5. Step 5: Solve for x
    x = 1,291,325.37/1,308.64
  6. Step 6: Final answer
    x = 986.77

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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.