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Finding the Fourth Proportional to 580.37, 800.38 and 390.98

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Solution

The fourth proportional to 580.37, 800.38 and 390.98 is: 539.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.37 : 800.38 = 390.98 : x
  2. Step 2: Convert to fraction form
    580.37/800.38 = 390.98/x
  3. Step 3: Cross multiply
    580.37x = 800.38 × 390.98
  4. Step 4: Simplify right side
    580.37x = 312,930.56
  5. Step 5: Solve for x
    x = 312,930.56/580.37
  6. Step 6: Final answer
    x = 539.20

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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.