Home / 18,878.06-28,320.50-7,778.57

Finding the Fourth Proportional to 18,878.06, 28,320.50 and 7,778.57

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Solution

The fourth proportional to 18,878.06, 28,320.50 and 7,778.57 is: 11,669.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.06 : 28,320.50 = 7,778.57 : x
  2. Step 2: Convert to fraction form
    18,878.06/28,320.50 = 7,778.57/x
  3. Step 3: Cross multiply
    18,878.06x = 28,320.50 × 7,778.57
  4. Step 4: Simplify right side
    18,878.06x = 220,292,991.69
  5. Step 5: Solve for x
    x = 220,292,991.69/18,878.06
  6. Step 6: Final answer
    x = 11,669.26

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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.