Home / 420,015.15-579,665.30-256,767.21

Finding the Fourth Proportional to 420,015.15, 579,665.30 and 256,767.21

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Solution

The fourth proportional to 420,015.15, 579,665.30 and 256,767.21 is: 354,365.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,015.15 : 579,665.30 = 256,767.21 : x
  2. Step 2: Convert to fraction form
    420,015.15/579,665.30 = 256,767.21/x
  3. Step 3: Cross multiply
    420,015.15x = 579,665.30 × 256,767.21
  4. Step 4: Simplify right side
    420,015.15x = 148,839,040,530.98
  5. Step 5: Solve for x
    x = 148,839,040,530.98/420,015.15
  6. Step 6: Final answer
    x = 354,365.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.