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Finding the Fourth Proportional to 422.81, 583.59 and 248.21

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Solution

The fourth proportional to 422.81, 583.59 and 248.21 is: 342.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.81 : 583.59 = 248.21 : x
  2. Step 2: Convert to fraction form
    422.81/583.59 = 248.21/x
  3. Step 3: Cross multiply
    422.81x = 583.59 × 248.21
  4. Step 4: Simplify right side
    422.81x = 144,848.71
  5. Step 5: Solve for x
    x = 144,848.71/422.81
  6. Step 6: Final answer
    x = 342.59

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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.