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Finding the Fourth Proportional to 838.90, 1,258.45 and 376.59

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Solution

The fourth proportional to 838.90, 1,258.45 and 376.59 is: 564.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.90 : 1,258.45 = 376.59 : x
  2. Step 2: Convert to fraction form
    838.90/1,258.45 = 376.59/x
  3. Step 3: Cross multiply
    838.90x = 1,258.45 × 376.59
  4. Step 4: Simplify right side
    838.90x = 473,918.74
  5. Step 5: Solve for x
    x = 473,918.74/838.90
  6. Step 6: Final answer
    x = 564.93

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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.