Home / 428,907.12-643,365.30-129,390.29

Finding the Fourth Proportional to 428,907.12, 643,365.30 and 129,390.29

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Solution

The fourth proportional to 428,907.12, 643,365.30 and 129,390.29 is: 194,086.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,907.12 : 643,365.30 = 129,390.29 : x
  2. Step 2: Convert to fraction form
    428,907.12/643,365.30 = 129,390.29/x
  3. Step 3: Cross multiply
    428,907.12x = 643,365.30 × 129,390.29
  4. Step 4: Simplify right side
    428,907.12x = 83,245,225,315.05
  5. Step 5: Solve for x
    x = 83,245,225,315.05/428,907.12
  6. Step 6: Final answer
    x = 194,086.84

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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.