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Finding the Fourth Proportional to 1,181.25, 1,630.50 and 1,056.69

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Solution

The fourth proportional to 1,181.25, 1,630.50 and 1,056.69 is: 1,458.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.25 : 1,630.50 = 1,056.69 : x
  2. Step 2: Convert to fraction form
    1,181.25/1,630.50 = 1,056.69/x
  3. Step 3: Cross multiply
    1,181.25x = 1,630.50 × 1,056.69
  4. Step 4: Simplify right side
    1,181.25x = 1,722,933.05
  5. Step 5: Solve for x
    x = 1,722,933.05/1,181.25
  6. Step 6: Final answer
    x = 1,458.57

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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.