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Finding the Fourth Proportional to 318,124.28, 439,019.91 and 172,939.83

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Solution

The fourth proportional to 318,124.28, 439,019.91 and 172,939.83 is: 238,661.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,124.28 : 439,019.91 = 172,939.83 : x
  2. Step 2: Convert to fraction form
    318,124.28/439,019.91 = 172,939.83/x
  3. Step 3: Cross multiply
    318,124.28x = 439,019.91 × 172,939.83
  4. Step 4: Simplify right side
    318,124.28x = 75,924,028,602.02
  5. Step 5: Solve for x
    x = 75,924,028,602.02/318,124.28
  6. Step 6: Final answer
    x = 238,661.53

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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.