Home / 138,735.78-191,444.46-78,321.12

Finding the Fourth Proportional to 138,735.78, 191,444.46 and 78,321.12

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Solution

The fourth proportional to 138,735.78, 191,444.46 and 78,321.12 is: 108,076.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,735.78 : 191,444.46 = 78,321.12 : x
  2. Step 2: Convert to fraction form
    138,735.78/191,444.46 = 78,321.12/x
  3. Step 3: Cross multiply
    138,735.78x = 191,444.46 × 78,321.12
  4. Step 4: Simplify right side
    138,735.78x = 14,994,144,525.00
  5. Step 5: Solve for x
    x = 14,994,144,525.00/138,735.78
  6. Step 6: Final answer
    x = 108,076.98

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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.