Home / 20,828.40-31,248.88-18,623.12

Finding the Fourth Proportional to 20,828.40, 31,248.88 and 18,623.12

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Solution

The fourth proportional to 20,828.40, 31,248.88 and 18,623.12 is: 27,940.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,828.40 : 31,248.88 = 18,623.12 : x
  2. Step 2: Convert to fraction form
    20,828.40/31,248.88 = 18,623.12/x
  3. Step 3: Cross multiply
    20,828.40x = 31,248.88 × 18,623.12
  4. Step 4: Simplify right side
    20,828.40x = 581,951,642.11
  5. Step 5: Solve for x
    x = 581,951,642.11/20,828.40
  6. Step 6: Final answer
    x = 27,940.30

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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.