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Finding the Fourth Proportional to 1,181.34, 1,629.39 and 918.78

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Solution

The fourth proportional to 1,181.34, 1,629.39 and 918.78 is: 1,267.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.34 : 1,629.39 = 918.78 : x
  2. Step 2: Convert to fraction form
    1,181.34/1,629.39 = 918.78/x
  3. Step 3: Cross multiply
    1,181.34x = 1,629.39 × 918.78
  4. Step 4: Simplify right side
    1,181.34x = 1,497,050.94
  5. Step 5: Solve for x
    x = 1,497,050.94/1,181.34
  6. Step 6: Final answer
    x = 1,267.25

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1.5x scale

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.