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Finding the Fourth Proportional to 838.77, 1,257.88 and 291.12

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Solution

The fourth proportional to 838.77, 1,257.88 and 291.12 is: 436.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.77 : 1,257.88 = 291.12 : x
  2. Step 2: Convert to fraction form
    838.77/1,257.88 = 291.12/x
  3. Step 3: Cross multiply
    838.77x = 1,257.88 × 291.12
  4. Step 4: Simplify right side
    838.77x = 366,194.03
  5. Step 5: Solve for x
    x = 366,194.03/838.77
  6. Step 6: Final answer
    x = 436.58

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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.