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Finding the Fourth Proportional to 1,638.22, 2,455.89 and 611.50

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Solution

The fourth proportional to 1,638.22, 2,455.89 and 611.50 is: 916.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.22 : 2,455.89 = 611.50 : x
  2. Step 2: Convert to fraction form
    1,638.22/2,455.89 = 611.50/x
  3. Step 3: Cross multiply
    1,638.22x = 2,455.89 × 611.50
  4. Step 4: Simplify right side
    1,638.22x = 1,501,776.74
  5. Step 5: Solve for x
    x = 1,501,776.74/1,638.22
  6. Step 6: Final answer
    x = 916.71

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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.