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Finding the Fourth Proportional to 1,638.11, 2,455.74 and 541.77

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Solution

The fourth proportional to 1,638.11, 2,455.74 and 541.77 is: 812.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.11 : 2,455.74 = 541.77 : x
  2. Step 2: Convert to fraction form
    1,638.11/2,455.74 = 541.77/x
  3. Step 3: Cross multiply
    1,638.11x = 2,455.74 × 541.77
  4. Step 4: Simplify right side
    1,638.11x = 1,330,446.26
  5. Step 5: Solve for x
    x = 1,330,446.26/1,638.11
  6. Step 6: Final answer
    x = 812.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.