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Finding the Fourth Proportional to 1,076.39, 1,485 and 634.13

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Solution

The fourth proportional to 1,076.39, 1,485 and 634.13 is: 874.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.39 : 1,485 = 634.13 : x
  2. Step 2: Convert to fraction form
    1,076.39/1,485 = 634.13/x
  3. Step 3: Cross multiply
    1,076.39x = 1,485 × 634.13
  4. Step 4: Simplify right side
    1,076.39x = 941,686.76
  5. Step 5: Solve for x
    x = 941,686.76/1,076.39
  6. Step 6: Final answer
    x = 874.85

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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.