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Finding the Fourth Proportional to 428,908.40, 643,247.40 and 179,538.80

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Solution

The fourth proportional to 428,908.40, 643,247.40 and 179,538.80 is: 269,259.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,908.40 : 643,247.40 = 179,538.80 : x
  2. Step 2: Convert to fraction form
    428,908.40/643,247.40 = 179,538.80/x
  3. Step 3: Cross multiply
    428,908.40x = 643,247.40 × 179,538.80
  4. Step 4: Simplify right side
    428,908.40x = 115,487,866,299.12
  5. Step 5: Solve for x
    x = 115,487,866,299.12/428,908.40
  6. Step 6: Final answer
    x = 269,259.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.