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Finding the Fourth Proportional to 399,391.46, 551,156.58 and 218,102.83

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Solution

The fourth proportional to 399,391.46, 551,156.58 and 218,102.83 is: 300,979.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,391.46 : 551,156.58 = 218,102.83 : x
  2. Step 2: Convert to fraction form
    399,391.46/551,156.58 = 218,102.83/x
  3. Step 3: Cross multiply
    399,391.46x = 551,156.58 × 218,102.83
  4. Step 4: Simplify right side
    399,391.46x = 120,208,807,879.82
  5. Step 5: Solve for x
    x = 120,208,807,879.82/399,391.46
  6. Step 6: Final answer
    x = 300,979.92

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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.