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Finding the Fourth Proportional to 399,280.80, 551,012.85 and 217,990.65

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Solution

The fourth proportional to 399,280.80, 551,012.85 and 217,990.65 is: 300,830.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,280.80 : 551,012.85 = 217,990.65 : x
  2. Step 2: Convert to fraction form
    399,280.80/551,012.85 = 217,990.65/x
  3. Step 3: Cross multiply
    399,280.80x = 551,012.85 × 217,990.65
  4. Step 4: Simplify right side
    399,280.80x = 120,115,649,329.85
  5. Step 5: Solve for x
    x = 120,115,649,329.85/399,280.80
  6. Step 6: Final answer
    x = 300,830.02

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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.