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Finding the Fourth Proportional to 30,819.20, 46,111.80 and 20,451.20

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Solution

The fourth proportional to 30,819.20, 46,111.80 and 20,451.20 is: 30,599.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,819.20 : 46,111.80 = 20,451.20 : x
  2. Step 2: Convert to fraction form
    30,819.20/46,111.80 = 20,451.20/x
  3. Step 3: Cross multiply
    30,819.20x = 46,111.80 × 20,451.20
  4. Step 4: Simplify right side
    30,819.20x = 943,041,644.16
  5. Step 5: Solve for x
    x = 943,041,644.16/30,819.20
  6. Step 6: Final answer
    x = 30,599.16

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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.