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Finding the Fourth Proportional to 266,112.80, 399,226.80 and 79,143.20

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Solution

The fourth proportional to 266,112.80, 399,226.80 and 79,143.20 is: 118,731.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,112.80 : 399,226.80 = 79,143.20 : x
  2. Step 2: Convert to fraction form
    266,112.80/399,226.80 = 79,143.20/x
  3. Step 3: Cross multiply
    266,112.80x = 399,226.80 × 79,143.20
  4. Step 4: Simplify right side
    266,112.80x = 31,596,086,477.76
  5. Step 5: Solve for x
    x = 31,596,086,477.76/266,112.80
  6. Step 6: Final answer
    x = 118,731.93

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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.