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Finding the Fourth Proportional to 428,020.40, 641,879.16 and 124,351.39

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Solution

The fourth proportional to 428,020.40, 641,879.16 and 124,351.39 is: 186,483.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,020.40 : 641,879.16 = 124,351.39 : x
  2. Step 2: Convert to fraction form
    428,020.40/641,879.16 = 124,351.39/x
  3. Step 3: Cross multiply
    428,020.40x = 641,879.16 × 124,351.39
  4. Step 4: Simplify right side
    428,020.40x = 79,818,565,758.03
  5. Step 5: Solve for x
    x = 79,818,565,758.03/428,020.40
  6. Step 6: Final answer
    x = 186,483.09

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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.