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Finding the Fourth Proportional to 326,939.40, 490,409.10 and 287,573.40

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Solution

The fourth proportional to 326,939.40, 490,409.10 and 287,573.40 is: 431,360.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,939.40 : 490,409.10 = 287,573.40 : x
  2. Step 2: Convert to fraction form
    326,939.40/490,409.10 = 287,573.40/x
  3. Step 3: Cross multiply
    326,939.40x = 490,409.10 × 287,573.40
  4. Step 4: Simplify right side
    326,939.40x = 141,028,612,277.94
  5. Step 5: Solve for x
    x = 141,028,612,277.94/326,939.40
  6. Step 6: Final answer
    x = 431,360.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.