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Finding the Fourth Proportional to 280,896.75, 421,400.72 and 91,344.90

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Solution

The fourth proportional to 280,896.75, 421,400.72 and 91,344.90 is: 137,035.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,896.75 : 421,400.72 = 91,344.90 : x
  2. Step 2: Convert to fraction form
    280,896.75/421,400.72 = 91,344.90/x
  3. Step 3: Cross multiply
    280,896.75x = 421,400.72 × 91,344.90
  4. Step 4: Simplify right side
    280,896.75x = 38,492,806,171.60
  5. Step 5: Solve for x
    x = 38,492,806,171.60/280,896.75
  6. Step 6: Final answer
    x = 137,035.43

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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.