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Finding the Fourth Proportional to 21,751.50, 30,017.10 and 11,815.50

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Solution

The fourth proportional to 21,751.50, 30,017.10 and 11,815.50 is: 16,305.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,751.50 : 30,017.10 = 11,815.50 : x
  2. Step 2: Convert to fraction form
    21,751.50/30,017.10 = 11,815.50/x
  3. Step 3: Cross multiply
    21,751.50x = 30,017.10 × 11,815.50
  4. Step 4: Simplify right side
    21,751.50x = 354,667,045.05
  5. Step 5: Solve for x
    x = 354,667,045.05/21,751.50
  6. Step 6: Final answer
    x = 16,305.41

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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.