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Finding the Fourth Proportional to 1,220.50, 1,684.29 and 668.50

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Solution

The fourth proportional to 1,220.50, 1,684.29 and 668.50 is: 922.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.50 : 1,684.29 = 668.50 : x
  2. Step 2: Convert to fraction form
    1,220.50/1,684.29 = 668.50/x
  3. Step 3: Cross multiply
    1,220.50x = 1,684.29 × 668.50
  4. Step 4: Simplify right side
    1,220.50x = 1,125,947.87
  5. Step 5: Solve for x
    x = 1,125,947.87/1,220.50
  6. Step 6: Final answer
    x = 922.53

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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.