Home / 428,924.37-643,391.19-129,407.55

Finding the Fourth Proportional to 428,924.37, 643,391.19 and 129,407.55

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Solution

The fourth proportional to 428,924.37, 643,391.19 and 129,407.55 is: 194,112.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,924.37 : 643,391.19 = 129,407.55 : x
  2. Step 2: Convert to fraction form
    428,924.37/643,391.19 = 129,407.55/x
  3. Step 3: Cross multiply
    428,924.37x = 643,391.19 × 129,407.55
  4. Step 4: Simplify right side
    428,924.37x = 83,259,677,589.48
  5. Step 5: Solve for x
    x = 83,259,677,589.48/428,924.37
  6. Step 6: Final answer
    x = 194,112.72

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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.