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Finding the Fourth Proportional to 420,659.94, 580,561.65 and 239,415.96

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Solution

The fourth proportional to 420,659.94, 580,561.65 and 239,415.96 is: 330,423.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,659.94 : 580,561.65 = 239,415.96 : x
  2. Step 2: Convert to fraction form
    420,659.94/580,561.65 = 239,415.96/x
  3. Step 3: Cross multiply
    420,659.94x = 580,561.65 × 239,415.96
  4. Step 4: Simplify right side
    420,659.94x = 138,995,724,773.93
  5. Step 5: Solve for x
    x = 138,995,724,773.93/420,659.94
  6. Step 6: Final answer
    x = 330,423.01

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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.