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Finding the Fourth Proportional to 1,406.43, 1,940.49 and 909.24

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Solution

The fourth proportional to 1,406.43, 1,940.49 and 909.24 is: 1,254.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.43 : 1,940.49 = 909.24 : x
  2. Step 2: Convert to fraction form
    1,406.43/1,940.49 = 909.24/x
  3. Step 3: Cross multiply
    1,406.43x = 1,940.49 × 909.24
  4. Step 4: Simplify right side
    1,406.43x = 1,764,371.13
  5. Step 5: Solve for x
    x = 1,764,371.13/1,406.43
  6. Step 6: Final answer
    x = 1,254.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.