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Finding the Fourth Proportional to 1,261.87, 1,741.26 and 930.48

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Solution

The fourth proportional to 1,261.87, 1,741.26 and 930.48 is: 1,283.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.87 : 1,741.26 = 930.48 : x
  2. Step 2: Convert to fraction form
    1,261.87/1,741.26 = 930.48/x
  3. Step 3: Cross multiply
    1,261.87x = 1,741.26 × 930.48
  4. Step 4: Simplify right side
    1,261.87x = 1,620,207.60
  5. Step 5: Solve for x
    x = 1,620,207.60/1,261.87
  6. Step 6: Final answer
    x = 1,283.97

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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.