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Finding the Fourth Proportional to 915.82, 1,374.06 and 422

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Solution

The fourth proportional to 915.82, 1,374.06 and 422 is: 633.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.82 : 1,374.06 = 422 : x
  2. Step 2: Convert to fraction form
    915.82/1,374.06 = 422/x
  3. Step 3: Cross multiply
    915.82x = 1,374.06 × 422
  4. Step 4: Simplify right side
    915.82x = 579,853.32
  5. Step 5: Solve for x
    x = 579,853.32/915.82
  6. Step 6: Final answer
    x = 633.15

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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.