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Finding the Fourth Proportional to 420,778.80, 580,705.80 and 239,549.36

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Solution

The fourth proportional to 420,778.80, 580,705.80 and 239,549.36 is: 330,595.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,778.80 : 580,705.80 = 239,549.36 : x
  2. Step 2: Convert to fraction form
    420,778.80/580,705.80 = 239,549.36/x
  3. Step 3: Cross multiply
    420,778.80x = 580,705.80 × 239,549.36
  4. Step 4: Simplify right side
    420,778.80x = 139,107,702,738.29
  5. Step 5: Solve for x
    x = 139,107,702,738.29/420,778.80
  6. Step 6: Final answer
    x = 330,595.80

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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.