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Finding the Fourth Proportional to 580.25, 800.45 and 393.68

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Solution

The fourth proportional to 580.25, 800.45 and 393.68 is: 543.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.25 : 800.45 = 393.68 : x
  2. Step 2: Convert to fraction form
    580.25/800.45 = 393.68/x
  3. Step 3: Cross multiply
    580.25x = 800.45 × 393.68
  4. Step 4: Simplify right side
    580.25x = 315,121.16
  5. Step 5: Solve for x
    x = 315,121.16/580.25
  6. Step 6: Final answer
    x = 543.08

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.