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Finding the Fourth Proportional to 1,222.40, 1,833.91 and 606.40

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Solution

The fourth proportional to 1,222.40, 1,833.91 and 606.40 is: 909.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.40 : 1,833.91 = 606.40 : x
  2. Step 2: Convert to fraction form
    1,222.40/1,833.91 = 606.40/x
  3. Step 3: Cross multiply
    1,222.40x = 1,833.91 × 606.40
  4. Step 4: Simplify right side
    1,222.40x = 1,112,076.92
  5. Step 5: Solve for x
    x = 1,112,076.92/1,222.40
  6. Step 6: Final answer
    x = 909.75

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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.