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Finding the Fourth Proportional to 428,068.80, 641,642.40 and 161,726.40

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Solution

The fourth proportional to 428,068.80, 641,642.40 and 161,726.40 is: 242,415.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,068.80 : 641,642.40 = 161,726.40 : x
  2. Step 2: Convert to fraction form
    428,068.80/641,642.40 = 161,726.40/x
  3. Step 3: Cross multiply
    428,068.80x = 641,642.40 × 161,726.40
  4. Step 4: Simplify right side
    428,068.80x = 103,770,515,439.36
  5. Step 5: Solve for x
    x = 103,770,515,439.36/428,068.80
  6. Step 6: Final answer
    x = 242,415.51

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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.