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Finding the Fourth Proportional to 21,815.70, 30,114.90 and 14,751.70

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Solution

The fourth proportional to 21,815.70, 30,114.90 and 14,751.70 is: 20,363.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.70 : 30,114.90 = 14,751.70 : x
  2. Step 2: Convert to fraction form
    21,815.70/30,114.90 = 14,751.70/x
  3. Step 3: Cross multiply
    21,815.70x = 30,114.90 × 14,751.70
  4. Step 4: Simplify right side
    21,815.70x = 444,245,970.33
  5. Step 5: Solve for x
    x = 444,245,970.33/21,815.70
  6. Step 6: Final answer
    x = 20,363.59

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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.