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Finding the Fourth Proportional to 266,078.20, 399,117.30 and 79,089.70

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Solution

The fourth proportional to 266,078.20, 399,117.30 and 79,089.70 is: 118,634.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,078.20 : 399,117.30 = 79,089.70 : x
  2. Step 2: Convert to fraction form
    266,078.20/399,117.30 = 79,089.70/x
  3. Step 3: Cross multiply
    266,078.20x = 399,117.30 × 79,089.70
  4. Step 4: Simplify right side
    266,078.20x = 31,566,067,521.81
  5. Step 5: Solve for x
    x = 31,566,067,521.81/266,078.20
  6. Step 6: Final answer
    x = 118,634.55

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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.