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Finding the Fourth Proportional to 139,215.88, 192,106.38 and 78,783.40

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Solution

The fourth proportional to 139,215.88, 192,106.38 and 78,783.40 is: 108,714.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,215.88 : 192,106.38 = 78,783.40 : x
  2. Step 2: Convert to fraction form
    139,215.88/192,106.38 = 78,783.40/x
  3. Step 3: Cross multiply
    139,215.88x = 192,106.38 × 78,783.40
  4. Step 4: Simplify right side
    139,215.88x = 15,134,793,778.09
  5. Step 5: Solve for x
    x = 15,134,793,778.09/139,215.88
  6. Step 6: Final answer
    x = 108,714.56

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1.5x scale

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.