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Finding the Fourth Proportional to 393,865.71, 543,531.92 and 215,017.71

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Solution

The fourth proportional to 393,865.71, 543,531.92 and 215,017.71 is: 296,722.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,865.71 : 543,531.92 = 215,017.71 : x
  2. Step 2: Convert to fraction form
    393,865.71/543,531.92 = 215,017.71/x
  3. Step 3: Cross multiply
    393,865.71x = 543,531.92 × 215,017.71
  4. Step 4: Simplify right side
    393,865.71x = 116,868,987,675.22
  5. Step 5: Solve for x
    x = 116,868,987,675.22/393,865.71
  6. Step 6: Final answer
    x = 296,722.93

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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.