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Finding the Fourth Proportional to 266,630.40, 399,990.40 and 79,660.80

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Solution

The fourth proportional to 266,630.40, 399,990.40 and 79,660.80 is: 119,504.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,630.40 : 399,990.40 = 79,660.80 : x
  2. Step 2: Convert to fraction form
    266,630.40/399,990.40 = 79,660.80/x
  3. Step 3: Cross multiply
    266,630.40x = 399,990.40 × 79,660.80
  4. Step 4: Simplify right side
    266,630.40x = 31,863,555,256.32
  5. Step 5: Solve for x
    x = 31,863,555,256.32/266,630.40
  6. Step 6: Final answer
    x = 119,504.58

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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.