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Finding the Fourth Proportional to 949.36, 1,422.57 and 640.12

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Solution

The fourth proportional to 949.36, 1,422.57 and 640.12 is: 959.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.36 : 1,422.57 = 640.12 : x
  2. Step 2: Convert to fraction form
    949.36/1,422.57 = 640.12/x
  3. Step 3: Cross multiply
    949.36x = 1,422.57 × 640.12
  4. Step 4: Simplify right side
    949.36x = 910,615.51
  5. Step 5: Solve for x
    x = 910,615.51/949.36
  6. Step 6: Final answer
    x = 959.19

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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.