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Finding the Fourth Proportional to 420,888.84, 580,855.89 and 239,600.73

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Solution

The fourth proportional to 420,888.84, 580,855.89 and 239,600.73 is: 330,665.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,888.84 : 580,855.89 = 239,600.73 : x
  2. Step 2: Convert to fraction form
    420,888.84/580,855.89 = 239,600.73/x
  3. Step 3: Cross multiply
    420,888.84x = 580,855.89 × 239,600.73
  4. Step 4: Simplify right side
    420,888.84x = 139,173,495,268.80
  5. Step 5: Solve for x
    x = 139,173,495,268.80/420,888.84
  6. Step 6: Final answer
    x = 330,665.69

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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.