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Finding the Fourth Proportional to 1,076.21, 1,485.38 and 634.49

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Solution

The fourth proportional to 1,076.21, 1,485.38 and 634.49 is: 875.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.21 : 1,485.38 = 634.49 : x
  2. Step 2: Convert to fraction form
    1,076.21/1,485.38 = 634.49/x
  3. Step 3: Cross multiply
    1,076.21x = 1,485.38 × 634.49
  4. Step 4: Simplify right side
    1,076.21x = 942,458.76
  5. Step 5: Solve for x
    x = 942,458.76/1,076.21
  6. Step 6: Final answer
    x = 875.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.