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Finding the Fourth Proportional to 408,790.49, 613,191.20 and 128,307.74

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Solution

The fourth proportional to 408,790.49, 613,191.20 and 128,307.74 is: 192,463.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,790.49 : 613,191.20 = 128,307.74 : x
  2. Step 2: Convert to fraction form
    408,790.49/613,191.20 = 128,307.74/x
  3. Step 3: Cross multiply
    408,790.49x = 613,191.20 × 128,307.74
  4. Step 4: Simplify right side
    408,790.49x = 78,677,173,352.39
  5. Step 5: Solve for x
    x = 78,677,173,352.39/408,790.49
  6. Step 6: Final answer
    x = 192,463.32

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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.