Home / 428,320.30-642,028.35-143,741.03

Finding the Fourth Proportional to 428,320.30, 642,028.35 and 143,741.03

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Solution

The fourth proportional to 428,320.30, 642,028.35 and 143,741.03 is: 215,459.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,320.30 : 642,028.35 = 143,741.03 : x
  2. Step 2: Convert to fraction form
    428,320.30/642,028.35 = 143,741.03/x
  3. Step 3: Cross multiply
    428,320.30x = 642,028.35 × 143,741.03
  4. Step 4: Simplify right side
    428,320.30x = 92,285,815,599.50
  5. Step 5: Solve for x
    x = 92,285,815,599.50/428,320.30
  6. Step 6: Final answer
    x = 215,459.82

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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.