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Finding the Fourth Proportional to 428,018.40, 641,876.16 and 124,349.39

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Solution

The fourth proportional to 428,018.40, 641,876.16 and 124,349.39 is: 186,480.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,018.40 : 641,876.16 = 124,349.39 : x
  2. Step 2: Convert to fraction form
    428,018.40/641,876.16 = 124,349.39/x
  3. Step 3: Cross multiply
    428,018.40x = 641,876.16 × 124,349.39
  4. Step 4: Simplify right side
    428,018.40x = 79,816,908,951.54
  5. Step 5: Solve for x
    x = 79,816,908,951.54/428,018.40
  6. Step 6: Final answer
    x = 186,480.09

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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.