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Finding the Fourth Proportional to 581.15, 871.41 and 398.75

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Solution

The fourth proportional to 581.15, 871.41 and 398.75 is: 597.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.15 : 871.41 = 398.75 : x
  2. Step 2: Convert to fraction form
    581.15/871.41 = 398.75/x
  3. Step 3: Cross multiply
    581.15x = 871.41 × 398.75
  4. Step 4: Simplify right side
    581.15x = 347,474.74
  5. Step 5: Solve for x
    x = 347,474.74/581.15
  6. Step 6: Final answer
    x = 597.91

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Why These Related Problems?

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