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Finding the Fourth Proportional to 28,546.40, 42,819.60 and 19,215.20

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Solution

The fourth proportional to 28,546.40, 42,819.60 and 19,215.20 is: 28,822.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,546.40 : 42,819.60 = 19,215.20 : x
  2. Step 2: Convert to fraction form
    28,546.40/42,819.60 = 19,215.20/x
  3. Step 3: Cross multiply
    28,546.40x = 42,819.60 × 19,215.20
  4. Step 4: Simplify right side
    28,546.40x = 822,787,177.92
  5. Step 5: Solve for x
    x = 822,787,177.92/28,546.40
  6. Step 6: Final answer
    x = 28,822.80

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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.