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Finding the Fourth Proportional to 318,172.47, 439,079.45 and 172,979.67

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Solution

The fourth proportional to 318,172.47, 439,079.45 and 172,979.67 is: 238,712.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,172.47 : 439,079.45 = 172,979.67 : x
  2. Step 2: Convert to fraction form
    318,172.47/439,079.45 = 172,979.67/x
  3. Step 3: Cross multiply
    318,172.47x = 439,079.45 × 172,979.67
  4. Step 4: Simplify right side
    318,172.47x = 75,951,817,499.88
  5. Step 5: Solve for x
    x = 75,951,817,499.88/318,172.47
  6. Step 6: Final answer
    x = 238,712.73

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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.