Home / 21,980.05-30,331.83-12,905.26

Finding the Fourth Proportional to 21,980.05, 30,331.83 and 12,905.26

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Solution

The fourth proportional to 21,980.05, 30,331.83 and 12,905.26 is: 17,808.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,980.05 : 30,331.83 = 12,905.26 : x
  2. Step 2: Convert to fraction form
    21,980.05/30,331.83 = 12,905.26/x
  3. Step 3: Cross multiply
    21,980.05x = 30,331.83 × 12,905.26
  4. Step 4: Simplify right side
    21,980.05x = 391,440,152.43
  5. Step 5: Solve for x
    x = 391,440,152.43/21,980.05
  6. Step 6: Final answer
    x = 17,808.88

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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.