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Finding the Fourth Proportional to 1,076.63, 1,485.78 and 634.91

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Solution

The fourth proportional to 1,076.63, 1,485.78 and 634.91 is: 876.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.63 : 1,485.78 = 634.91 : x
  2. Step 2: Convert to fraction form
    1,076.63/1,485.78 = 634.91/x
  3. Step 3: Cross multiply
    1,076.63x = 1,485.78 × 634.91
  4. Step 4: Simplify right side
    1,076.63x = 943,326.77
  5. Step 5: Solve for x
    x = 943,326.77/1,076.63
  6. Step 6: Final answer
    x = 876.19

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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.