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Finding the Fourth Proportional to 1,620.34, 2,236.28 and 990.74

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Solution

The fourth proportional to 1,620.34, 2,236.28 and 990.74 is: 1,367.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.34 : 2,236.28 = 990.74 : x
  2. Step 2: Convert to fraction form
    1,620.34/2,236.28 = 990.74/x
  3. Step 3: Cross multiply
    1,620.34x = 2,236.28 × 990.74
  4. Step 4: Simplify right side
    1,620.34x = 2,215,572.68
  5. Step 5: Solve for x
    x = 2,215,572.68/1,620.34
  6. Step 6: Final answer
    x = 1,367.35

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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.