Home / 257,619.86-386,495.20-80,128.20

Finding the Fourth Proportional to 257,619.86, 386,495.20 and 80,128.20

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Solution

The fourth proportional to 257,619.86, 386,495.20 and 80,128.20 is: 120,212.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,619.86 : 386,495.20 = 80,128.20 : x
  2. Step 2: Convert to fraction form
    257,619.86/386,495.20 = 80,128.20/x
  3. Step 3: Cross multiply
    257,619.86x = 386,495.20 × 80,128.20
  4. Step 4: Simplify right side
    257,619.86x = 30,969,164,684.64
  5. Step 5: Solve for x
    x = 30,969,164,684.64/257,619.86
  6. Step 6: Final answer
    x = 120,212.64

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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.