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Finding the Fourth Proportional to 9,121.80, 13,698.90 and 6,659.40

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Solution

The fourth proportional to 9,121.80, 13,698.90 and 6,659.40 is: 10,000.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,121.80 : 13,698.90 = 6,659.40 : x
  2. Step 2: Convert to fraction form
    9,121.80/13,698.90 = 6,659.40/x
  3. Step 3: Cross multiply
    9,121.80x = 13,698.90 × 6,659.40
  4. Step 4: Simplify right side
    9,121.80x = 91,226,454.66
  5. Step 5: Solve for x
    x = 91,226,454.66/9,121.80
  6. Step 6: Final answer
    x = 10,000.93

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1.5x scale

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.