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Finding the Fourth Proportional to 1,638.69, 2,261.35 and 892.63

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Solution

The fourth proportional to 1,638.69, 2,261.35 and 892.63 is: 1,231.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.69 : 2,261.35 = 892.63 : x
  2. Step 2: Convert to fraction form
    1,638.69/2,261.35 = 892.63/x
  3. Step 3: Cross multiply
    1,638.69x = 2,261.35 × 892.63
  4. Step 4: Simplify right side
    1,638.69x = 2,018,548.85
  5. Step 5: Solve for x
    x = 2,018,548.85/1,638.69
  6. Step 6: Final answer
    x = 1,231.81

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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.