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Finding the Fourth Proportional to 420,363.20, 580,078.32 and 239,050.64

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Solution

The fourth proportional to 420,363.20, 580,078.32 and 239,050.64 is: 329,876.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,363.20 : 580,078.32 = 239,050.64 : x
  2. Step 2: Convert to fraction form
    420,363.20/580,078.32 = 239,050.64/x
  3. Step 3: Cross multiply
    420,363.20x = 580,078.32 × 239,050.64
  4. Step 4: Simplify right side
    420,363.20x = 138,668,093,646.13
  5. Step 5: Solve for x
    x = 138,668,093,646.13/420,363.20
  6. Step 6: Final answer
    x = 329,876.86

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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.