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Finding the Fourth Proportional to 12,388.90, 17,081.94 and 9,020.92

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Solution

The fourth proportional to 12,388.90, 17,081.94 and 9,020.92 is: 12,438.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,388.90 : 17,081.94 = 9,020.92 : x
  2. Step 2: Convert to fraction form
    12,388.90/17,081.94 = 9,020.92/x
  3. Step 3: Cross multiply
    12,388.90x = 17,081.94 × 9,020.92
  4. Step 4: Simplify right side
    12,388.90x = 154,094,814.18
  5. Step 5: Solve for x
    x = 154,094,814.18/12,388.90
  6. Step 6: Final answer
    x = 12,438.14

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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.