Home / 428,965.07-643,452.15-129,448.28

Finding the Fourth Proportional to 428,965.07, 643,452.15 and 129,448.28

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Solution

The fourth proportional to 428,965.07, 643,452.15 and 129,448.28 is: 194,173.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,965.07 : 643,452.15 = 129,448.28 : x
  2. Step 2: Convert to fraction form
    428,965.07/643,452.15 = 129,448.28/x
  3. Step 3: Cross multiply
    428,965.07x = 643,452.15 × 129,448.28
  4. Step 4: Simplify right side
    428,965.07x = 83,293,772,554.45
  5. Step 5: Solve for x
    x = 83,293,772,554.45/428,965.07
  6. Step 6: Final answer
    x = 194,173.79

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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.