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Finding the Fourth Proportional to 8,638.25, 11,917.02 and 5,281.20

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Solution

The fourth proportional to 8,638.25, 11,917.02 and 5,281.20 is: 7,285.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.25 : 11,917.02 = 5,281.20 : x
  2. Step 2: Convert to fraction form
    8,638.25/11,917.02 = 5,281.20/x
  3. Step 3: Cross multiply
    8,638.25x = 11,917.02 × 5,281.20
  4. Step 4: Simplify right side
    8,638.25x = 62,936,185.83
  5. Step 5: Solve for x
    x = 62,936,185.83/8,638.25
  6. Step 6: Final answer
    x = 7,285.76

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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.