Home / 28,128.80-42,195.36-8,405.84

Finding the Fourth Proportional to 28,128.80, 42,195.36 and 8,405.84

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Solution

The fourth proportional to 28,128.80, 42,195.36 and 8,405.84 is: 12,609.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,128.80 : 42,195.36 = 8,405.84 : x
  2. Step 2: Convert to fraction form
    28,128.80/42,195.36 = 8,405.84/x
  3. Step 3: Cross multiply
    28,128.80x = 42,195.36 × 8,405.84
  4. Step 4: Simplify right side
    28,128.80x = 354,687,444.90
  5. Step 5: Solve for x
    x = 354,687,444.90/28,128.80
  6. Step 6: Final answer
    x = 12,609.41

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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.