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Finding the Fourth Proportional to 18,443.70, 25,478.55 and 15,819.30

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Solution

The fourth proportional to 18,443.70, 25,478.55 and 15,819.30 is: 21,853.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,443.70 : 25,478.55 = 15,819.30 : x
  2. Step 2: Convert to fraction form
    18,443.70/25,478.55 = 15,819.30/x
  3. Step 3: Cross multiply
    18,443.70x = 25,478.55 × 15,819.30
  4. Step 4: Simplify right side
    18,443.70x = 403,052,826.02
  5. Step 5: Solve for x
    x = 403,052,826.02/18,443.70
  6. Step 6: Final answer
    x = 21,853.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.