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Finding the Fourth Proportional to 1,270.53, 1,905.85 and 490.26

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Solution

The fourth proportional to 1,270.53, 1,905.85 and 490.26 is: 735.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.53 : 1,905.85 = 490.26 : x
  2. Step 2: Convert to fraction form
    1,270.53/1,905.85 = 490.26/x
  3. Step 3: Cross multiply
    1,270.53x = 1,905.85 × 490.26
  4. Step 4: Simplify right side
    1,270.53x = 934,362.02
  5. Step 5: Solve for x
    x = 934,362.02/1,270.53
  6. Step 6: Final answer
    x = 735.41

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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.