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Finding the Fourth Proportional to 1,270.15, 1,905.22 and 837.20

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Solution

The fourth proportional to 1,270.15, 1,905.22 and 837.20 is: 1,255.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.15 : 1,905.22 = 837.20 : x
  2. Step 2: Convert to fraction form
    1,270.15/1,905.22 = 837.20/x
  3. Step 3: Cross multiply
    1,270.15x = 1,905.22 × 837.20
  4. Step 4: Simplify right side
    1,270.15x = 1,595,055.99
  5. Step 5: Solve for x
    x = 1,595,055.99/1,270.15
  6. Step 6: Final answer
    x = 1,255.80

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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.