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Finding the Fourth Proportional to 408,591.63, 612,887.45 and 128,130.75

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Solution

The fourth proportional to 408,591.63, 612,887.45 and 128,130.75 is: 192,196.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,591.63 : 612,887.45 = 128,130.75 : x
  2. Step 2: Convert to fraction form
    408,591.63/612,887.45 = 128,130.75/x
  3. Step 3: Cross multiply
    408,591.63x = 612,887.45 × 128,130.75
  4. Step 4: Simplify right side
    408,591.63x = 78,529,727,993.43
  5. Step 5: Solve for x
    x = 78,529,727,993.43/408,591.63
  6. Step 6: Final answer
    x = 192,196.13

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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.