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Finding the Fourth Proportional to 21,911.20, 32,818.20 and 18,995.20

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Solution

The fourth proportional to 21,911.20, 32,818.20 and 18,995.20 is: 28,450.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,911.20 : 32,818.20 = 18,995.20 : x
  2. Step 2: Convert to fraction form
    21,911.20/32,818.20 = 18,995.20/x
  3. Step 3: Cross multiply
    21,911.20x = 32,818.20 × 18,995.20
  4. Step 4: Simplify right side
    21,911.20x = 623,388,272.64
  5. Step 5: Solve for x
    x = 623,388,272.64/21,911.20
  6. Step 6: Final answer
    x = 28,450.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.