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Finding the Fourth Proportional to 428,786.70, 643,048.37 and 296,516.94

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Solution

The fourth proportional to 428,786.70, 643,048.37 and 296,516.94 is: 444,684.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,786.70 : 643,048.37 = 296,516.94 : x
  2. Step 2: Convert to fraction form
    428,786.70/643,048.37 = 296,516.94/x
  3. Step 3: Cross multiply
    428,786.70x = 643,048.37 × 296,516.94
  4. Step 4: Simplify right side
    428,786.70x = 190,674,732,162.31
  5. Step 5: Solve for x
    x = 190,674,732,162.31/428,786.70
  6. Step 6: Final answer
    x = 444,684.35

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1.5x scale

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.