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Finding the Fourth Proportional to 837.77, 1,256.36 and 289.80

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Solution

The fourth proportional to 837.77, 1,256.36 and 289.80 is: 434.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.77 : 1,256.36 = 289.80 : x
  2. Step 2: Convert to fraction form
    837.77/1,256.36 = 289.80/x
  3. Step 3: Cross multiply
    837.77x = 1,256.36 × 289.80
  4. Step 4: Simplify right side
    837.77x = 364,091.68
  5. Step 5: Solve for x
    x = 364,091.68/837.77
  6. Step 6: Final answer
    x = 434.60

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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.