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Finding the Fourth Proportional to 399,271.92, 551,003.88 and 217,991.46

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Solution

The fourth proportional to 399,271.92, 551,003.88 and 217,991.46 is: 300,832.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,271.92 : 551,003.88 = 217,991.46 : x
  2. Step 2: Convert to fraction form
    399,271.92/551,003.88 = 217,991.46/x
  3. Step 3: Cross multiply
    399,271.92x = 551,003.88 × 217,991.46
  4. Step 4: Simplify right side
    399,271.92x = 120,114,140,266.87
  5. Step 5: Solve for x
    x = 120,114,140,266.87/399,271.92
  6. Step 6: Final answer
    x = 300,832.93

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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.