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Finding the Fourth Proportional to 321,472.80, 443,645.10 and 178,248.60

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Solution

The fourth proportional to 321,472.80, 443,645.10 and 178,248.60 is: 245,990.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,472.80 : 443,645.10 = 178,248.60 : x
  2. Step 2: Convert to fraction form
    321,472.80/443,645.10 = 178,248.60/x
  3. Step 3: Cross multiply
    321,472.80x = 443,645.10 × 178,248.60
  4. Step 4: Simplify right side
    321,472.80x = 79,079,117,971.86
  5. Step 5: Solve for x
    x = 79,079,117,971.86/321,472.80
  6. Step 6: Final answer
    x = 245,990.07

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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.