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Finding the Fourth Proportional to 385,310.55, 531,707.16 and 215,511.87

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Solution

The fourth proportional to 385,310.55, 531,707.16 and 215,511.87 is: 297,394.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,310.55 : 531,707.16 = 215,511.87 : x
  2. Step 2: Convert to fraction form
    385,310.55/531,707.16 = 215,511.87/x
  3. Step 3: Cross multiply
    385,310.55x = 531,707.16 × 215,511.87
  4. Step 4: Simplify right side
    385,310.55x = 114,589,204,343.99
  5. Step 5: Solve for x
    x = 114,589,204,343.99/385,310.55
  6. Step 6: Final answer
    x = 297,394.41

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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.