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Finding the Fourth Proportional to 28,620.30, 42,930.45 and 12,825.30

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Solution

The fourth proportional to 28,620.30, 42,930.45 and 12,825.30 is: 19,237.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,620.30 : 42,930.45 = 12,825.30 : x
  2. Step 2: Convert to fraction form
    28,620.30/42,930.45 = 12,825.30/x
  3. Step 3: Cross multiply
    28,620.30x = 42,930.45 × 12,825.30
  4. Step 4: Simplify right side
    28,620.30x = 550,595,900.39
  5. Step 5: Solve for x
    x = 550,595,900.39/28,620.30
  6. Step 6: Final answer
    x = 19,237.95

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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.