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Finding the Fourth Proportional to 9,921.75, 13,692.03 and 5,505.75

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Solution

The fourth proportional to 9,921.75, 13,692.03 and 5,505.75 is: 7,597.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,921.75 : 13,692.03 = 5,505.75 : x
  2. Step 2: Convert to fraction form
    9,921.75/13,692.03 = 5,505.75/x
  3. Step 3: Cross multiply
    9,921.75x = 13,692.03 × 5,505.75
  4. Step 4: Simplify right side
    9,921.75x = 75,384,894.17
  5. Step 5: Solve for x
    x = 75,384,894.17/9,921.75
  6. Step 6: Final answer
    x = 7,597.94

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1.5x scale

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.