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Finding the Fourth Proportional to 588.36, 811.20 and 391.44

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Solution

The fourth proportional to 588.36, 811.20 and 391.44 is: 539.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    588.36 : 811.20 = 391.44 : x
  2. Step 2: Convert to fraction form
    588.36/811.20 = 391.44/x
  3. Step 3: Cross multiply
    588.36x = 811.20 × 391.44
  4. Step 4: Simplify right side
    588.36x = 317,536.13
  5. Step 5: Solve for x
    x = 317,536.13/588.36
  6. Step 6: Final answer
    x = 539.70

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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.