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Finding the Fourth Proportional to 30,363.80, 45,521.40 and 12,819.20

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Solution

The fourth proportional to 30,363.80, 45,521.40 and 12,819.20 is: 19,218.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,363.80 : 45,521.40 = 12,819.20 : x
  2. Step 2: Convert to fraction form
    30,363.80/45,521.40 = 12,819.20/x
  3. Step 3: Cross multiply
    30,363.80x = 45,521.40 × 12,819.20
  4. Step 4: Simplify right side
    30,363.80x = 583,547,930.88
  5. Step 5: Solve for x
    x = 583,547,930.88/30,363.80
  6. Step 6: Final answer
    x = 19,218.54

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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.