Home / 428,029.56-642,043.53-128,509.65

Finding the Fourth Proportional to 428,029.56, 642,043.53 and 128,509.65

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Solution

The fourth proportional to 428,029.56, 642,043.53 and 128,509.65 is: 192,764.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,029.56 : 642,043.53 = 128,509.65 : x
  2. Step 2: Convert to fraction form
    428,029.56/642,043.53 = 128,509.65/x
  3. Step 3: Cross multiply
    428,029.56x = 642,043.53 × 128,509.65
  4. Step 4: Simplify right side
    428,029.56x = 82,508,789,325.06
  5. Step 5: Solve for x
    x = 82,508,789,325.06/428,029.56
  6. Step 6: Final answer
    x = 192,764.23

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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.