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Finding the Fourth Proportional to 1,270.86, 1,905.97 and 405.18

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Solution

The fourth proportional to 1,270.86, 1,905.97 and 405.18 is: 607.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.86 : 1,905.97 = 405.18 : x
  2. Step 2: Convert to fraction form
    1,270.86/1,905.97 = 405.18/x
  3. Step 3: Cross multiply
    1,270.86x = 1,905.97 × 405.18
  4. Step 4: Simplify right side
    1,270.86x = 772,260.92
  5. Step 5: Solve for x
    x = 772,260.92/1,270.86
  6. Step 6: Final answer
    x = 607.67

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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.