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Finding the Fourth Proportional to 305,851.36, 421,928.36 and 215,257.60

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Solution

The fourth proportional to 305,851.36, 421,928.36 and 215,257.60 is: 296,952.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,851.36 : 421,928.36 = 215,257.60 : x
  2. Step 2: Convert to fraction form
    305,851.36/421,928.36 = 215,257.60/x
  3. Step 3: Cross multiply
    305,851.36x = 421,928.36 × 215,257.60
  4. Step 4: Simplify right side
    305,851.36x = 90,823,286,145.54
  5. Step 5: Solve for x
    x = 90,823,286,145.54/305,851.36
  6. Step 6: Final answer
    x = 296,952.37

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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.