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Finding the Fourth Proportional to 1,620.96, 2,431.44 and 890.40

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Solution

The fourth proportional to 1,620.96, 2,431.44 and 890.40 is: 1,335.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.96 : 2,431.44 = 890.40 : x
  2. Step 2: Convert to fraction form
    1,620.96/2,431.44 = 890.40/x
  3. Step 3: Cross multiply
    1,620.96x = 2,431.44 × 890.40
  4. Step 4: Simplify right side
    1,620.96x = 2,164,954.18
  5. Step 5: Solve for x
    x = 2,164,954.18/1,620.96
  6. Step 6: Final answer
    x = 1,335.60

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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.