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Finding the Fourth Proportional to 20,980.88, 28,944.36 and 13,007.12

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Solution

The fourth proportional to 20,980.88, 28,944.36 and 13,007.12 is: 17,944.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.88 : 28,944.36 = 13,007.12 : x
  2. Step 2: Convert to fraction form
    20,980.88/28,944.36 = 13,007.12/x
  3. Step 3: Cross multiply
    20,980.88x = 28,944.36 × 13,007.12
  4. Step 4: Simplify right side
    20,980.88x = 376,482,763.84
  5. Step 5: Solve for x
    x = 376,482,763.84/20,980.88
  6. Step 6: Final answer
    x = 17,944.09

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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.