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Finding the Fourth Proportional to 838.38, 1,258.35 and 427.82

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Solution

The fourth proportional to 838.38, 1,258.35 and 427.82 is: 642.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.38 : 1,258.35 = 427.82 : x
  2. Step 2: Convert to fraction form
    838.38/1,258.35 = 427.82/x
  3. Step 3: Cross multiply
    838.38x = 1,258.35 × 427.82
  4. Step 4: Simplify right side
    838.38x = 538,350.44
  5. Step 5: Solve for x
    x = 538,350.44/838.38
  6. Step 6: Final answer
    x = 642.13

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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.