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Finding the Fourth Proportional to 1,270.21, 1,904.91 and 404.32

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Solution

The fourth proportional to 1,270.21, 1,904.91 and 404.32 is: 606.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.21 : 1,904.91 = 404.32 : x
  2. Step 2: Convert to fraction form
    1,270.21/1,904.91 = 404.32/x
  3. Step 3: Cross multiply
    1,270.21x = 1,904.91 × 404.32
  4. Step 4: Simplify right side
    1,270.21x = 770,193.21
  5. Step 5: Solve for x
    x = 770,193.21/1,270.21
  6. Step 6: Final answer
    x = 606.35

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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.