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Finding the Fourth Proportional to 420,912.55, 580,870.69 and 251,245.09

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Solution

The fourth proportional to 420,912.55, 580,870.69 and 251,245.09 is: 346,725.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,912.55 : 580,870.69 = 251,245.09 : x
  2. Step 2: Convert to fraction form
    420,912.55/580,870.69 = 251,245.09/x
  3. Step 3: Cross multiply
    420,912.55x = 580,870.69 × 251,245.09
  4. Step 4: Simplify right side
    420,912.55x = 145,940,910,298.64
  5. Step 5: Solve for x
    x = 145,940,910,298.64/420,912.55
  6. Step 6: Final answer
    x = 346,725.01

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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.