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Finding the Fourth Proportional to 9,121.40, 13,690.20 and 7,890.20

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Solution

The fourth proportional to 9,121.40, 13,690.20 and 7,890.20 is: 11,842.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,121.40 : 13,690.20 = 7,890.20 : x
  2. Step 2: Convert to fraction form
    9,121.40/13,690.20 = 7,890.20/x
  3. Step 3: Cross multiply
    9,121.40x = 13,690.20 × 7,890.20
  4. Step 4: Simplify right side
    9,121.40x = 108,018,416.04
  5. Step 5: Solve for x
    x = 108,018,416.04/9,121.40
  6. Step 6: Final answer
    x = 11,842.31

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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.