Home / 428,473.28-643,105.20-218,267.84

Finding the Fourth Proportional to 428,473.28, 643,105.20 and 218,267.84

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Solution

The fourth proportional to 428,473.28, 643,105.20 and 218,267.84 is: 327,603.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,473.28 : 643,105.20 = 218,267.84 : x
  2. Step 2: Convert to fraction form
    428,473.28/643,105.20 = 218,267.84/x
  3. Step 3: Cross multiply
    428,473.28x = 643,105.20 × 218,267.84
  4. Step 4: Simplify right side
    428,473.28x = 140,369,182,896.77
  5. Step 5: Solve for x
    x = 140,369,182,896.77/428,473.28
  6. Step 6: Final answer
    x = 327,603.12

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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.