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Finding the Fourth Proportional to 20,969.80, 28,935.02 and 12,015.58

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Solution

The fourth proportional to 20,969.80, 28,935.02 and 12,015.58 is: 16,579.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.80 : 28,935.02 = 12,015.58 : x
  2. Step 2: Convert to fraction form
    20,969.80/28,935.02 = 12,015.58/x
  3. Step 3: Cross multiply
    20,969.80x = 28,935.02 × 12,015.58
  4. Step 4: Simplify right side
    20,969.80x = 347,671,047.61
  5. Step 5: Solve for x
    x = 347,671,047.61/20,969.80
  6. Step 6: Final answer
    x = 16,579.61

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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.