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Finding the Fourth Proportional to 235,857.12, 325,478.16 and 128,428.44

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Solution

The fourth proportional to 235,857.12, 325,478.16 and 128,428.44 is: 177,228.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,857.12 : 325,478.16 = 128,428.44 : x
  2. Step 2: Convert to fraction form
    235,857.12/325,478.16 = 128,428.44/x
  3. Step 3: Cross multiply
    235,857.12x = 325,478.16 × 128,428.44
  4. Step 4: Simplify right side
    235,857.12x = 41,800,652,342.87
  5. Step 5: Solve for x
    x = 41,800,652,342.87/235,857.12
  6. Step 6: Final answer
    x = 177,228.71

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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.