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Finding the Fourth Proportional to 393,918, 543,606.84 and 215,070

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Solution

The fourth proportional to 393,918, 543,606.84 and 215,070 is: 296,796.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,918 : 543,606.84 = 215,070 : x
  2. Step 2: Convert to fraction form
    393,918/543,606.84 = 215,070/x
  3. Step 3: Cross multiply
    393,918x = 543,606.84 × 215,070
  4. Step 4: Simplify right side
    393,918x = 116,913,523,078.80
  5. Step 5: Solve for x
    x = 116,913,523,078.80/393,918
  6. Step 6: Final answer
    x = 296,796.60

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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.