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Finding the Fourth Proportional to 393,703, 543,310.14 and 214,855

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Solution

The fourth proportional to 393,703, 543,310.14 and 214,855 is: 296,499.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,703 : 543,310.14 = 214,855 : x
  2. Step 2: Convert to fraction form
    393,703/543,310.14 = 214,855/x
  3. Step 3: Cross multiply
    393,703x = 543,310.14 × 214,855
  4. Step 4: Simplify right side
    393,703x = 116,732,900,129.70
  5. Step 5: Solve for x
    x = 116,732,900,129.70/393,703
  6. Step 6: Final answer
    x = 296,499.90

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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.