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Finding the Fourth Proportional to 9,187.75, 12,679.11 and 5,209.23

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Solution

The fourth proportional to 9,187.75, 12,679.11 and 5,209.23 is: 7,188.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,187.75 : 12,679.11 = 5,209.23 : x
  2. Step 2: Convert to fraction form
    9,187.75/12,679.11 = 5,209.23/x
  3. Step 3: Cross multiply
    9,187.75x = 12,679.11 × 5,209.23
  4. Step 4: Simplify right side
    9,187.75x = 66,048,400.19
  5. Step 5: Solve for x
    x = 66,048,400.19/9,187.75
  6. Step 6: Final answer
    x = 7,188.75

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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.