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Finding the Fourth Proportional to 7,179.63, 9,912.73 and 6,421.05

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Solution

The fourth proportional to 7,179.63, 9,912.73 and 6,421.05 is: 8,865.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,179.63 : 9,912.73 = 6,421.05 : x
  2. Step 2: Convert to fraction form
    7,179.63/9,912.73 = 6,421.05/x
  3. Step 3: Cross multiply
    7,179.63x = 9,912.73 × 6,421.05
  4. Step 4: Simplify right side
    7,179.63x = 63,650,134.97
  5. Step 5: Solve for x
    x = 63,650,134.97/7,179.63
  6. Step 6: Final answer
    x = 8,865.38

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Half scale
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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.