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Finding the Fourth Proportional to 842.89, 1,264.40 and 265.75

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Solution

The fourth proportional to 842.89, 1,264.40 and 265.75 is: 398.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.89 : 1,264.40 = 265.75 : x
  2. Step 2: Convert to fraction form
    842.89/1,264.40 = 265.75/x
  3. Step 3: Cross multiply
    842.89x = 1,264.40 × 265.75
  4. Step 4: Simplify right side
    842.89x = 336,012.97
  5. Step 5: Solve for x
    x = 336,012.97/842.89
  6. Step 6: Final answer
    x = 398.64

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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.