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Finding the Fourth Proportional to 1,216.90, 1,679.70 and 969.31

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Solution

The fourth proportional to 1,216.90, 1,679.70 and 969.31 is: 1,337.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.90 : 1,679.70 = 969.31 : x
  2. Step 2: Convert to fraction form
    1,216.90/1,679.70 = 969.31/x
  3. Step 3: Cross multiply
    1,216.90x = 1,679.70 × 969.31
  4. Step 4: Simplify right side
    1,216.90x = 1,628,150.01
  5. Step 5: Solve for x
    x = 1,628,150.01/1,216.90
  6. Step 6: Final answer
    x = 1,337.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.