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Finding the Fourth Proportional to 922.85, 1,279.02 and 905.57

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Solution

The fourth proportional to 922.85, 1,279.02 and 905.57 is: 1,255.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.85 : 1,279.02 = 905.57 : x
  2. Step 2: Convert to fraction form
    922.85/1,279.02 = 905.57/x
  3. Step 3: Cross multiply
    922.85x = 1,279.02 × 905.57
  4. Step 4: Simplify right side
    922.85x = 1,158,239.14
  5. Step 5: Solve for x
    x = 1,158,239.14/922.85
  6. Step 6: Final answer
    x = 1,255.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.