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Finding the Fourth Proportional to 7,179.13, 9,912.04 and 6,420.55

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Solution

The fourth proportional to 7,179.13, 9,912.04 and 6,420.55 is: 8,864.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,179.13 : 9,912.04 = 6,420.55 : x
  2. Step 2: Convert to fraction form
    7,179.13/9,912.04 = 6,420.55/x
  3. Step 3: Cross multiply
    7,179.13x = 9,912.04 × 6,420.55
  4. Step 4: Simplify right side
    7,179.13x = 63,640,726.18
  5. Step 5: Solve for x
    x = 63,640,726.18/7,179.13
  6. Step 6: Final answer
    x = 8,864.68

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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.