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Finding the Fourth Proportional to 21,230.75, 31,860.75 and 7,379.75

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Solution

The fourth proportional to 21,230.75, 31,860.75 and 7,379.75 is: 11,074.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,230.75 : 31,860.75 = 7,379.75 : x
  2. Step 2: Convert to fraction form
    21,230.75/31,860.75 = 7,379.75/x
  3. Step 3: Cross multiply
    21,230.75x = 31,860.75 × 7,379.75
  4. Step 4: Simplify right side
    21,230.75x = 235,124,369.81
  5. Step 5: Solve for x
    x = 235,124,369.81/21,230.75
  6. Step 6: Final answer
    x = 11,074.71

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1.5x scale

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.