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Finding the Fourth Proportional to 580.80, 871.74 and 418.80

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Solution

The fourth proportional to 580.80, 871.74 and 418.80 is: 628.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.80 : 871.74 = 418.80 : x
  2. Step 2: Convert to fraction form
    580.80/871.74 = 418.80/x
  3. Step 3: Cross multiply
    580.80x = 871.74 × 418.80
  4. Step 4: Simplify right side
    580.80x = 365,084.71
  5. Step 5: Solve for x
    x = 365,084.71/580.80
  6. Step 6: Final answer
    x = 628.59

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.