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Finding the Fourth Proportional to 385,399.50, 531,851.31 and 215,666.43

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Solution

The fourth proportional to 385,399.50, 531,851.31 and 215,666.43 is: 297,619.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,399.50 : 531,851.31 = 215,666.43 : x
  2. Step 2: Convert to fraction form
    385,399.50/531,851.31 = 215,666.43/x
  3. Step 3: Cross multiply
    385,399.50x = 531,851.31 × 215,666.43
  4. Step 4: Simplify right side
    385,399.50x = 114,702,473,318.52
  5. Step 5: Solve for x
    x = 114,702,473,318.52/385,399.50
  6. Step 6: Final answer
    x = 297,619.67

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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.