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Finding the Fourth Proportional to 408,892.64, 613,437.78 and 128,409.89

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Solution

The fourth proportional to 408,892.64, 613,437.78 and 128,409.89 is: 192,645.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,892.64 : 613,437.78 = 128,409.89 : x
  2. Step 2: Convert to fraction form
    408,892.64/613,437.78 = 128,409.89/x
  3. Step 3: Cross multiply
    408,892.64x = 613,437.78 × 128,409.89
  4. Step 4: Simplify right side
    408,892.64x = 78,771,477,851.64
  5. Step 5: Solve for x
    x = 78,771,477,851.64/408,892.64
  6. Step 6: Final answer
    x = 192,645.87

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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.