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Finding the Fourth Proportional to 420,659.64, 580,523.12 and 239,397.64

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Solution

The fourth proportional to 420,659.64, 580,523.12 and 239,397.64 is: 330,376.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,659.64 : 580,523.12 = 239,397.64 : x
  2. Step 2: Convert to fraction form
    420,659.64/580,523.12 = 239,397.64/x
  3. Step 3: Cross multiply
    420,659.64x = 580,523.12 × 239,397.64
  4. Step 4: Simplify right side
    420,659.64x = 138,975,864,893.44
  5. Step 5: Solve for x
    x = 138,975,864,893.44/420,659.64
  6. Step 6: Final answer
    x = 330,376.04

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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.