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Finding the Fourth Proportional to 12,828.40, 19,245.40 and 7,284.40

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Solution

The fourth proportional to 12,828.40, 19,245.40 and 7,284.40 is: 10,928.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,828.40 : 19,245.40 = 7,284.40 : x
  2. Step 2: Convert to fraction form
    12,828.40/19,245.40 = 7,284.40/x
  3. Step 3: Cross multiply
    12,828.40x = 19,245.40 × 7,284.40
  4. Step 4: Simplify right side
    12,828.40x = 140,191,191.76
  5. Step 5: Solve for x
    x = 140,191,191.76/12,828.40
  6. Step 6: Final answer
    x = 10,928.19

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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.