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Finding the Fourth Proportional to 890.25, 1,335.21 and 240.90

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Solution

The fourth proportional to 890.25, 1,335.21 and 240.90 is: 361.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.25 : 1,335.21 = 240.90 : x
  2. Step 2: Convert to fraction form
    890.25/1,335.21 = 240.90/x
  3. Step 3: Cross multiply
    890.25x = 1,335.21 × 240.90
  4. Step 4: Simplify right side
    890.25x = 321,652.09
  5. Step 5: Solve for x
    x = 321,652.09/890.25
  6. Step 6: Final answer
    x = 361.31

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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.