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Finding the Fourth Proportional to 922.09, 1,381.20 and 628.60

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Solution

The fourth proportional to 922.09, 1,381.20 and 628.60 is: 941.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.09 : 1,381.20 = 628.60 : x
  2. Step 2: Convert to fraction form
    922.09/1,381.20 = 628.60/x
  3. Step 3: Cross multiply
    922.09x = 1,381.20 × 628.60
  4. Step 4: Simplify right side
    922.09x = 868,222.32
  5. Step 5: Solve for x
    x = 868,222.32/922.09
  6. Step 6: Final answer
    x = 941.58

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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.