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Finding the Fourth Proportional to 393,279.84, 542,729.97 and 223,515.18

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Solution

The fourth proportional to 393,279.84, 542,729.97 and 223,515.18 is: 308,453.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,279.84 : 542,729.97 = 223,515.18 : x
  2. Step 2: Convert to fraction form
    393,279.84/542,729.97 = 223,515.18/x
  3. Step 3: Cross multiply
    393,279.84x = 542,729.97 × 223,515.18
  4. Step 4: Simplify right side
    393,279.84x = 121,308,386,935.95
  5. Step 5: Solve for x
    x = 121,308,386,935.95/393,279.84
  6. Step 6: Final answer
    x = 308,453.10

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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.