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Finding the Fourth Proportional to 519,696.80, 780,128.40 and 401,890.40

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Solution

The fourth proportional to 519,696.80, 780,128.40 and 401,890.40 is: 603,286.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,696.80 : 780,128.40 = 401,890.40 : x
  2. Step 2: Convert to fraction form
    519,696.80/780,128.40 = 401,890.40/x
  3. Step 3: Cross multiply
    519,696.80x = 780,128.40 × 401,890.40
  4. Step 4: Simplify right side
    519,696.80x = 313,526,114,727.36
  5. Step 5: Solve for x
    x = 313,526,114,727.36/519,696.80
  6. Step 6: Final answer
    x = 603,286.60

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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.