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Finding the Fourth Proportional to 20,973.80, 28,940.54 and 12,019.58

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Solution

The fourth proportional to 20,973.80, 28,940.54 and 12,019.58 is: 16,585.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,973.80 : 28,940.54 = 12,019.58 : x
  2. Step 2: Convert to fraction form
    20,973.80/28,940.54 = 12,019.58/x
  3. Step 3: Cross multiply
    20,973.80x = 28,940.54 × 12,019.58
  4. Step 4: Simplify right side
    20,973.80x = 347,853,135.77
  5. Step 5: Solve for x
    x = 347,853,135.77/20,973.80
  6. Step 6: Final answer
    x = 16,585.13

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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.