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Finding the Fourth Proportional to 12,983.40, 19,431.90 and 11,428.20

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Solution

The fourth proportional to 12,983.40, 19,431.90 and 11,428.20 is: 17,104.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,983.40 : 19,431.90 = 11,428.20 : x
  2. Step 2: Convert to fraction form
    12,983.40/19,431.90 = 11,428.20/x
  3. Step 3: Cross multiply
    12,983.40x = 19,431.90 × 11,428.20
  4. Step 4: Simplify right side
    12,983.40x = 222,071,639.58
  5. Step 5: Solve for x
    x = 222,071,639.58/12,983.40
  6. Step 6: Final answer
    x = 17,104.27

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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.