Home / 18,918.48-28,381.44-7,819.20

Finding the Fourth Proportional to 18,918.48, 28,381.44 and 7,819.20

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Solution

The fourth proportional to 18,918.48, 28,381.44 and 7,819.20 is: 11,730.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.48 : 28,381.44 = 7,819.20 : x
  2. Step 2: Convert to fraction form
    18,918.48/28,381.44 = 7,819.20/x
  3. Step 3: Cross multiply
    18,918.48x = 28,381.44 × 7,819.20
  4. Step 4: Simplify right side
    18,918.48x = 221,920,155.65
  5. Step 5: Solve for x
    x = 221,920,155.65/18,918.48
  6. Step 6: Final answer
    x = 11,730.34

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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.