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Finding the Fourth Proportional to 399,379.78, 551,123.55 and 218,056.76

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Solution

The fourth proportional to 399,379.78, 551,123.55 and 218,056.76 is: 300,907.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,379.78 : 551,123.55 = 218,056.76 : x
  2. Step 2: Convert to fraction form
    399,379.78/551,123.55 = 218,056.76/x
  3. Step 3: Cross multiply
    399,379.78x = 551,123.55 × 218,056.76
  4. Step 4: Simplify right side
    399,379.78x = 120,176,215,672.70
  5. Step 5: Solve for x
    x = 120,176,215,672.70/399,379.78
  6. Step 6: Final answer
    x = 300,907.11

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1.5x scale

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.