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Finding the Fourth Proportional to 397.08, 591.39 and 391.05

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Solution

The fourth proportional to 397.08, 591.39 and 391.05 is: 582.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.08 : 591.39 = 391.05 : x
  2. Step 2: Convert to fraction form
    397.08/591.39 = 391.05/x
  3. Step 3: Cross multiply
    397.08x = 591.39 × 391.05
  4. Step 4: Simplify right side
    397.08x = 231,263.06
  5. Step 5: Solve for x
    x = 231,263.06/397.08
  6. Step 6: Final answer
    x = 582.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.