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Finding the Fourth Proportional to 949.02, 1,422.60 and 640.19

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Solution

The fourth proportional to 949.02, 1,422.60 and 640.19 is: 959.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.02 : 1,422.60 = 640.19 : x
  2. Step 2: Convert to fraction form
    949.02/1,422.60 = 640.19/x
  3. Step 3: Cross multiply
    949.02x = 1,422.60 × 640.19
  4. Step 4: Simplify right side
    949.02x = 910,727.18
  5. Step 5: Solve for x
    x = 910,727.18/949.02
  6. Step 6: Final answer
    x = 959.65

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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.