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Finding the Fourth Proportional to 7,323.78, 10,986.75 and 2,128.98

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Solution

The fourth proportional to 7,323.78, 10,986.75 and 2,128.98 is: 3,193.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,323.78 : 10,986.75 = 2,128.98 : x
  2. Step 2: Convert to fraction form
    7,323.78/10,986.75 = 2,128.98/x
  3. Step 3: Cross multiply
    7,323.78x = 10,986.75 × 2,128.98
  4. Step 4: Simplify right side
    7,323.78x = 23,390,571.02
  5. Step 5: Solve for x
    x = 23,390,571.02/7,323.78
  6. Step 6: Final answer
    x = 3,193.78

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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.