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Finding the Fourth Proportional to 1,971.40, 2,955.60 and 998.20

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Solution

The fourth proportional to 1,971.40, 2,955.60 and 998.20 is: 1,496.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.40 : 2,955.60 = 998.20 : x
  2. Step 2: Convert to fraction form
    1,971.40/2,955.60 = 998.20/x
  3. Step 3: Cross multiply
    1,971.40x = 2,955.60 × 998.20
  4. Step 4: Simplify right side
    1,971.40x = 2,950,279.92
  5. Step 5: Solve for x
    x = 2,950,279.92/1,971.40
  6. Step 6: Final answer
    x = 1,496.54

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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.