Home / 128,928.12-193,391.91-72,742.74

Finding the Fourth Proportional to 128,928.12, 193,391.91 and 72,742.74

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Solution

The fourth proportional to 128,928.12, 193,391.91 and 72,742.74 is: 109,113.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,928.12 : 193,391.91 = 72,742.74 : x
  2. Step 2: Convert to fraction form
    128,928.12/193,391.91 = 72,742.74/x
  3. Step 3: Cross multiply
    128,928.12x = 193,391.91 × 72,742.74
  4. Step 4: Simplify right side
    128,928.12x = 14,067,857,427.23
  5. Step 5: Solve for x
    x = 14,067,857,427.23/128,928.12
  6. Step 6: Final answer
    x = 109,113.96

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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.