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Finding the Fourth Proportional to 21,756.68, 30,023.12 and 12,195.40

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Solution

The fourth proportional to 21,756.68, 30,023.12 and 12,195.40 is: 16,829.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,756.68 : 30,023.12 = 12,195.40 : x
  2. Step 2: Convert to fraction form
    21,756.68/30,023.12 = 12,195.40/x
  3. Step 3: Cross multiply
    21,756.68x = 30,023.12 × 12,195.40
  4. Step 4: Simplify right side
    21,756.68x = 366,143,957.65
  5. Step 5: Solve for x
    x = 366,143,957.65/21,756.68
  6. Step 6: Final answer
    x = 16,829.04

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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.