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Finding the Fourth Proportional to 21,911.40, 32,867.10 and 18,995.40

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Solution

The fourth proportional to 21,911.40, 32,867.10 and 18,995.40 is: 28,493.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,911.40 : 32,867.10 = 18,995.40 : x
  2. Step 2: Convert to fraction form
    21,911.40/32,867.10 = 18,995.40/x
  3. Step 3: Cross multiply
    21,911.40x = 32,867.10 × 18,995.40
  4. Step 4: Simplify right side
    21,911.40x = 624,323,711.34
  5. Step 5: Solve for x
    x = 624,323,711.34/21,911.40
  6. Step 6: Final answer
    x = 28,493.10

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Similar ratio
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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.