Home / 138,779.56-191,389.86-91,015.72

Finding the Fourth Proportional to 138,779.56, 191,389.86 and 91,015.72

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Solution

The fourth proportional to 138,779.56, 191,389.86 and 91,015.72 is: 125,519.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,779.56 : 191,389.86 = 91,015.72 : x
  2. Step 2: Convert to fraction form
    138,779.56/191,389.86 = 91,015.72/x
  3. Step 3: Cross multiply
    138,779.56x = 191,389.86 × 91,015.72
  4. Step 4: Simplify right side
    138,779.56x = 17,419,485,908.60
  5. Step 5: Solve for x
    x = 17,419,485,908.60/138,779.56
  6. Step 6: Final answer
    x = 125,519.10

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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.