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Finding the Fourth Proportional to 1,985.33, 2,978.09 and 1,638.02

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Solution

The fourth proportional to 1,985.33, 2,978.09 and 1,638.02 is: 2,457.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.33 : 2,978.09 = 1,638.02 : x
  2. Step 2: Convert to fraction form
    1,985.33/2,978.09 = 1,638.02/x
  3. Step 3: Cross multiply
    1,985.33x = 2,978.09 × 1,638.02
  4. Step 4: Simplify right side
    1,985.33x = 4,878,170.98
  5. Step 5: Solve for x
    x = 4,878,170.98/1,985.33
  6. Step 6: Final answer
    x = 2,457.11

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