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Finding the Fourth Proportional to 1,235.22, 1,851.21 and 909.06

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Solution

The fourth proportional to 1,235.22, 1,851.21 and 909.06 is: 1,362.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.22 : 1,851.21 = 909.06 : x
  2. Step 2: Convert to fraction form
    1,235.22/1,851.21 = 909.06/x
  3. Step 3: Cross multiply
    1,235.22x = 1,851.21 × 909.06
  4. Step 4: Simplify right side
    1,235.22x = 1,682,860.96
  5. Step 5: Solve for x
    x = 1,682,860.96/1,235.22
  6. Step 6: Final answer
    x = 1,362.40

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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.