Home / 428,918.36-643,382.19-129,401.55

Finding the Fourth Proportional to 428,918.36, 643,382.19 and 129,401.55

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Solution

The fourth proportional to 428,918.36, 643,382.19 and 129,401.55 is: 194,103.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,918.36 : 643,382.19 = 129,401.55 : x
  2. Step 2: Convert to fraction form
    428,918.36/643,382.19 = 129,401.55/x
  3. Step 3: Cross multiply
    428,918.36x = 643,382.19 × 129,401.55
  4. Step 4: Simplify right side
    428,918.36x = 83,254,652,628.39
  5. Step 5: Solve for x
    x = 83,254,652,628.39/428,918.36
  6. Step 6: Final answer
    x = 194,103.73

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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.