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Finding the Fourth Proportional to 351,800.72, 485,219.36 and 221,016.40

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Solution

The fourth proportional to 351,800.72, 485,219.36 and 221,016.40 is: 304,835.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,800.72 : 485,219.36 = 221,016.40 : x
  2. Step 2: Convert to fraction form
    351,800.72/485,219.36 = 221,016.40/x
  3. Step 3: Cross multiply
    351,800.72x = 485,219.36 × 221,016.40
  4. Step 4: Simplify right side
    351,800.72x = 107,241,435,497.00
  5. Step 5: Solve for x
    x = 107,241,435,497.00/351,800.72
  6. Step 6: Final answer
    x = 304,835.75

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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.