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Finding the Fourth Proportional to 18,821.30, 28,231.96 and 13,197.06

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Solution

The fourth proportional to 18,821.30, 28,231.96 and 13,197.06 is: 19,795.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.30 : 28,231.96 = 13,197.06 : x
  2. Step 2: Convert to fraction form
    18,821.30/28,231.96 = 13,197.06/x
  3. Step 3: Cross multiply
    18,821.30x = 28,231.96 × 13,197.06
  4. Step 4: Simplify right side
    18,821.30x = 372,578,870.04
  5. Step 5: Solve for x
    x = 372,578,870.04/18,821.30
  6. Step 6: Final answer
    x = 19,795.60

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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.