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Finding the Fourth Proportional to 1,322.45, 1,823.09 and 949.31

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Solution

The fourth proportional to 1,322.45, 1,823.09 and 949.31 is: 1,308.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.45 : 1,823.09 = 949.31 : x
  2. Step 2: Convert to fraction form
    1,322.45/1,823.09 = 949.31/x
  3. Step 3: Cross multiply
    1,322.45x = 1,823.09 × 949.31
  4. Step 4: Simplify right side
    1,322.45x = 1,730,663.71
  5. Step 5: Solve for x
    x = 1,730,663.71/1,322.45
  6. Step 6: Final answer
    x = 1,308.68

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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.