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Finding the Fourth Proportional to 1,322.40, 1,823.76 and 949.20

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Solution

The fourth proportional to 1,322.40, 1,823.76 and 949.20 is: 1,309.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.40 : 1,823.76 = 949.20 : x
  2. Step 2: Convert to fraction form
    1,322.40/1,823.76 = 949.20/x
  3. Step 3: Cross multiply
    1,322.40x = 1,823.76 × 949.20
  4. Step 4: Simplify right side
    1,322.40x = 1,731,112.99
  5. Step 5: Solve for x
    x = 1,731,112.99/1,322.40
  6. Step 6: Final answer
    x = 1,309.07

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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.