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Finding the Fourth Proportional to 521,991.40, 720,314.02 and 307,089.94

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Solution

The fourth proportional to 521,991.40, 720,314.02 and 307,089.94 is: 423,764.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,991.40 : 720,314.02 = 307,089.94 : x
  2. Step 2: Convert to fraction form
    521,991.40/720,314.02 = 307,089.94/x
  3. Step 3: Cross multiply
    521,991.40x = 720,314.02 × 307,089.94
  4. Step 4: Simplify right side
    521,991.40x = 221,201,189,182.96
  5. Step 5: Solve for x
    x = 221,201,189,182.96/521,991.40
  6. Step 6: Final answer
    x = 423,764.05

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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.