Home / 12,189.63-16,821.28-6,812.40

Finding the Fourth Proportional to 12,189.63, 16,821.28 and 6,812.40

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Solution

The fourth proportional to 12,189.63, 16,821.28 and 6,812.40 is: 9,400.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,189.63 : 16,821.28 = 6,812.40 : x
  2. Step 2: Convert to fraction form
    12,189.63/16,821.28 = 6,812.40/x
  3. Step 3: Cross multiply
    12,189.63x = 16,821.28 × 6,812.40
  4. Step 4: Simplify right side
    12,189.63x = 114,593,287.87
  5. Step 5: Solve for x
    x = 114,593,287.87/12,189.63
  6. Step 6: Final answer
    x = 9,400.88

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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.