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Finding the Fourth Proportional to 315,939.68, 436,008.48 and 172,709.44

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Solution

The fourth proportional to 315,939.68, 436,008.48 and 172,709.44 is: 238,345.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,939.68 : 436,008.48 = 172,709.44 : x
  2. Step 2: Convert to fraction form
    315,939.68/436,008.48 = 172,709.44/x
  3. Step 3: Cross multiply
    315,939.68x = 436,008.48 × 172,709.44
  4. Step 4: Simplify right side
    315,939.68x = 75,302,780,416.05
  5. Step 5: Solve for x
    x = 75,302,780,416.05/315,939.68
  6. Step 6: Final answer
    x = 238,345.43

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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.