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Finding the Fourth Proportional to 390,509.91, 538,896.53 and 220,744.04

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Solution

The fourth proportional to 390,509.91, 538,896.53 and 220,744.04 is: 304,622.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,509.91 : 538,896.53 = 220,744.04 : x
  2. Step 2: Convert to fraction form
    390,509.91/538,896.53 = 220,744.04/x
  3. Step 3: Cross multiply
    390,509.91x = 538,896.53 × 220,744.04
  4. Step 4: Simplify right side
    390,509.91x = 118,958,193,375.98
  5. Step 5: Solve for x
    x = 118,958,193,375.98/390,509.91
  6. Step 6: Final answer
    x = 304,622.73

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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.