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Finding the Fourth Proportional to 1,181.08, 1,629.98 and 657.12

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Solution

The fourth proportional to 1,181.08, 1,629.98 and 657.12 is: 906.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.08 : 1,629.98 = 657.12 : x
  2. Step 2: Convert to fraction form
    1,181.08/1,629.98 = 657.12/x
  3. Step 3: Cross multiply
    1,181.08x = 1,629.98 × 657.12
  4. Step 4: Simplify right side
    1,181.08x = 1,071,092.46
  5. Step 5: Solve for x
    x = 1,071,092.46/1,181.08
  6. Step 6: Final answer
    x = 906.88

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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.