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Finding the Fourth Proportional to 1,982.21, 2,970.95 and 812.16

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Solution

The fourth proportional to 1,982.21, 2,970.95 and 812.16 is: 1,217.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,982.21 : 2,970.95 = 812.16 : x
  2. Step 2: Convert to fraction form
    1,982.21/2,970.95 = 812.16/x
  3. Step 3: Cross multiply
    1,982.21x = 2,970.95 × 812.16
  4. Step 4: Simplify right side
    1,982.21x = 2,412,882.69
  5. Step 5: Solve for x
    x = 2,412,882.69/1,982.21
  6. Step 6: Final answer
    x = 1,217.27

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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.