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Finding the Fourth Proportional to 1,181.03, 1,629.90 and 782.01

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Solution

The fourth proportional to 1,181.03, 1,629.90 and 782.01 is: 1,079.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.03 : 1,629.90 = 782.01 : x
  2. Step 2: Convert to fraction form
    1,181.03/1,629.90 = 782.01/x
  3. Step 3: Cross multiply
    1,181.03x = 1,629.90 × 782.01
  4. Step 4: Simplify right side
    1,181.03x = 1,274,598.10
  5. Step 5: Solve for x
    x = 1,274,598.10/1,181.03
  6. Step 6: Final answer
    x = 1,079.23

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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.