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Finding the Fourth Proportional to 8,638.48, 11,921.12 and 4,912.48

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Solution

The fourth proportional to 8,638.48, 11,921.12 and 4,912.48 is: 6,779.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.48 : 11,921.12 = 4,912.48 : x
  2. Step 2: Convert to fraction form
    8,638.48/11,921.12 = 4,912.48/x
  3. Step 3: Cross multiply
    8,638.48x = 11,921.12 × 4,912.48
  4. Step 4: Simplify right side
    8,638.48x = 58,562,263.58
  5. Step 5: Solve for x
    x = 58,562,263.58/8,638.48
  6. Step 6: Final answer
    x = 6,779.23

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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.