Home / 78,212.21-117,335.39-28,287.09

Finding the Fourth Proportional to 78,212.21, 117,335.39 and 28,287.09

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Solution

The fourth proportional to 78,212.21, 117,335.39 and 28,287.09 is: 42,436.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,212.21 : 117,335.39 = 28,287.09 : x
  2. Step 2: Convert to fraction form
    78,212.21/117,335.39 = 28,287.09/x
  3. Step 3: Cross multiply
    78,212.21x = 117,335.39 × 28,287.09
  4. Step 4: Simplify right side
    78,212.21x = 3,319,076,595.68
  5. Step 5: Solve for x
    x = 3,319,076,595.68/78,212.21
  6. Step 6: Final answer
    x = 42,436.81

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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.