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Finding the Fourth Proportional to 1,076.19, 1,485.17 and 634.20

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Solution

The fourth proportional to 1,076.19, 1,485.17 and 634.20 is: 875.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.19 : 1,485.17 = 634.20 : x
  2. Step 2: Convert to fraction form
    1,076.19/1,485.17 = 634.20/x
  3. Step 3: Cross multiply
    1,076.19x = 1,485.17 × 634.20
  4. Step 4: Simplify right side
    1,076.19x = 941,891.64
  5. Step 5: Solve for x
    x = 941,891.64/1,076.19
  6. Step 6: Final answer
    x = 875.21

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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.