Home / 21,816.81-30,107.18-12,385.37

Finding the Fourth Proportional to 21,816.81, 30,107.18 and 12,385.37

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Solution

The fourth proportional to 21,816.81, 30,107.18 and 12,385.37 is: 17,091.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,816.81 : 30,107.18 = 12,385.37 : x
  2. Step 2: Convert to fraction form
    21,816.81/30,107.18 = 12,385.37/x
  3. Step 3: Cross multiply
    21,816.81x = 30,107.18 × 12,385.37
  4. Step 4: Simplify right side
    21,816.81x = 372,888,600.52
  5. Step 5: Solve for x
    x = 372,888,600.52/21,816.81
  6. Step 6: Final answer
    x = 17,091.80

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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.