Home / 428,320.12-642,028.07-143,740.84

Finding the Fourth Proportional to 428,320.12, 642,028.07 and 143,740.84

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Solution

The fourth proportional to 428,320.12, 642,028.07 and 143,740.84 is: 215,459.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,320.12 : 642,028.07 = 143,740.84 : x
  2. Step 2: Convert to fraction form
    428,320.12/642,028.07 = 143,740.84/x
  3. Step 3: Cross multiply
    428,320.12x = 642,028.07 × 143,740.84
  4. Step 4: Simplify right side
    428,320.12x = 92,285,653,366.67
  5. Step 5: Solve for x
    x = 92,285,653,366.67/428,320.12
  6. Step 6: Final answer
    x = 215,459.53

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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.