Home / 139,215.08-192,114.08-78,784.60

Finding the Fourth Proportional to 139,215.08, 192,114.08 and 78,784.60

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Solution

The fourth proportional to 139,215.08, 192,114.08 and 78,784.60 is: 108,721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,215.08 : 192,114.08 = 78,784.60 : x
  2. Step 2: Convert to fraction form
    139,215.08/192,114.08 = 78,784.60/x
  3. Step 3: Cross multiply
    139,215.08x = 192,114.08 × 78,784.60
  4. Step 4: Simplify right side
    139,215.08x = 15,135,630,947.17
  5. Step 5: Solve for x
    x = 15,135,630,947.17/139,215.08
  6. Step 6: Final answer
    x = 108,721.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.