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Finding the Fourth Proportional to 422, 582.42 and 266.72

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Solution

The fourth proportional to 422, 582.42 and 266.72 is: 368.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    422 : 582.42 = 266.72 : x
  2. Step 2: Convert to fraction form
    422/582.42 = 266.72/x
  3. Step 3: Cross multiply
    422x = 582.42 × 266.72
  4. Step 4: Simplify right side
    422x = 155,343.06
  5. Step 5: Solve for x
    x = 155,343.06/422
  6. Step 6: Final answer
    x = 368.11

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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.