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Finding the Fourth Proportional to 128,425.30, 192,856.65 and 91,246.30

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Solution

The fourth proportional to 128,425.30, 192,856.65 and 91,246.30 is: 137,024.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,425.30 : 192,856.65 = 91,246.30 : x
  2. Step 2: Convert to fraction form
    128,425.30/192,856.65 = 91,246.30/x
  3. Step 3: Cross multiply
    128,425.30x = 192,856.65 × 91,246.30
  4. Step 4: Simplify right side
    128,425.30x = 17,597,455,742.90
  5. Step 5: Solve for x
    x = 17,597,455,742.90/128,425.30
  6. Step 6: Final answer
    x = 137,024.84

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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.