Home / 20,118.90-30,156.48-8,418.45

Finding the Fourth Proportional to 20,118.90, 30,156.48 and 8,418.45

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Solution

The fourth proportional to 20,118.90, 30,156.48 and 8,418.45 is: 12,618.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,118.90 : 30,156.48 = 8,418.45 : x
  2. Step 2: Convert to fraction form
    20,118.90/30,156.48 = 8,418.45/x
  3. Step 3: Cross multiply
    20,118.90x = 30,156.48 × 8,418.45
  4. Step 4: Simplify right side
    20,118.90x = 253,870,819.06
  5. Step 5: Solve for x
    x = 253,870,819.06/20,118.90
  6. Step 6: Final answer
    x = 12,618.52

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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.