Home / 85,379.45-128,067.38-28,457.48

Finding the Fourth Proportional to 85,379.45, 128,067.38 and 28,457.48

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Solution

The fourth proportional to 85,379.45, 128,067.38 and 28,457.48 is: 42,685.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,379.45 : 128,067.38 = 28,457.48 : x
  2. Step 2: Convert to fraction form
    85,379.45/128,067.38 = 28,457.48/x
  3. Step 3: Cross multiply
    85,379.45x = 128,067.38 × 28,457.48
  4. Step 4: Simplify right side
    85,379.45x = 3,644,474,905.00
  5. Step 5: Solve for x
    x = 3,644,474,905.00/85,379.45
  6. Step 6: Final answer
    x = 42,685.62

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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.