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Finding the Fourth Proportional to 588.40, 812.20 and 391.84

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Solution

The fourth proportional to 588.40, 812.20 and 391.84 is: 540.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    588.40 : 812.20 = 391.84 : x
  2. Step 2: Convert to fraction form
    588.40/812.20 = 391.84/x
  3. Step 3: Cross multiply
    588.40x = 812.20 × 391.84
  4. Step 4: Simplify right side
    588.40x = 318,252.45
  5. Step 5: Solve for x
    x = 318,252.45/588.40
  6. Step 6: Final answer
    x = 540.88

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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.