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Finding the Fourth Proportional to 521,993.40, 720,316.78 and 307,091.94

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Solution

The fourth proportional to 521,993.40, 720,316.78 and 307,091.94 is: 423,766.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,993.40 : 720,316.78 = 307,091.94 : x
  2. Step 2: Convert to fraction form
    521,993.40/720,316.78 = 307,091.94/x
  3. Step 3: Cross multiply
    521,993.40x = 720,316.78 × 307,091.94
  4. Step 4: Simplify right side
    521,993.40x = 221,203,477,384.75
  5. Step 5: Solve for x
    x = 221,203,477,384.75/521,993.40
  6. Step 6: Final answer
    x = 423,766.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.