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Finding the Fourth Proportional to 1,270.56, 1,905.96 and 490.56

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Solution

The fourth proportional to 1,270.56, 1,905.96 and 490.56 is: 735.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.56 : 1,905.96 = 490.56 : x
  2. Step 2: Convert to fraction form
    1,270.56/1,905.96 = 490.56/x
  3. Step 3: Cross multiply
    1,270.56x = 1,905.96 × 490.56
  4. Step 4: Simplify right side
    1,270.56x = 934,987.74
  5. Step 5: Solve for x
    x = 934,987.74/1,270.56
  6. Step 6: Final answer
    x = 735.89

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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.