Home / 78,078.40-117,104.32-28,148.56

Finding the Fourth Proportional to 78,078.40, 117,104.32 and 28,148.56

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Solution

The fourth proportional to 78,078.40, 117,104.32 and 28,148.56 is: 42,218.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,078.40 : 117,104.32 = 28,148.56 : x
  2. Step 2: Convert to fraction form
    78,078.40/117,104.32 = 28,148.56/x
  3. Step 3: Cross multiply
    78,078.40x = 117,104.32 × 28,148.56
  4. Step 4: Simplify right side
    78,078.40x = 3,296,317,977.78
  5. Step 5: Solve for x
    x = 3,296,317,977.78/78,078.40
  6. Step 6: Final answer
    x = 42,218.05

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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.