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Finding the Fourth Proportional to 521,992.40, 720,315.40 and 307,090.94

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Solution

The fourth proportional to 521,992.40, 720,315.40 and 307,090.94 is: 423,765.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,992.40 : 720,315.40 = 307,090.94 : x
  2. Step 2: Convert to fraction form
    521,992.40/720,315.40 = 307,090.94/x
  3. Step 3: Cross multiply
    521,992.40x = 720,315.40 × 307,090.94
  4. Step 4: Simplify right side
    521,992.40x = 221,202,333,282.48
  5. Step 5: Solve for x
    x = 221,202,333,282.48/521,992.40
  6. Step 6: Final answer
    x = 423,765.43

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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.