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Finding the Fourth Proportional to 390,438.68, 537,687.89 and 366,109.21

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Solution

The fourth proportional to 390,438.68, 537,687.89 and 366,109.21 is: 504,182.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,438.68 : 537,687.89 = 366,109.21 : x
  2. Step 2: Convert to fraction form
    390,438.68/537,687.89 = 366,109.21/x
  3. Step 3: Cross multiply
    390,438.68x = 537,687.89 × 366,109.21
  4. Step 4: Simplify right side
    390,438.68x = 196,852,488,634.47
  5. Step 5: Solve for x
    x = 196,852,488,634.47/390,438.68
  6. Step 6: Final answer
    x = 504,182.86

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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.