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Finding the Fourth Proportional to 1,107.40, 1,661.06 and 423.40

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Solution

The fourth proportional to 1,107.40, 1,661.06 and 423.40 is: 635.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.40 : 1,661.06 = 423.40 : x
  2. Step 2: Convert to fraction form
    1,107.40/1,661.06 = 423.40/x
  3. Step 3: Cross multiply
    1,107.40x = 1,661.06 × 423.40
  4. Step 4: Simplify right side
    1,107.40x = 703,292.80
  5. Step 5: Solve for x
    x = 703,292.80/1,107.40
  6. Step 6: Final answer
    x = 635.08

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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.