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Finding the Fourth Proportional to 588.40, 811.66 and 391.64

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Solution

The fourth proportional to 588.40, 811.66 and 391.64 is: 540.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    588.40 : 811.66 = 391.64 : x
  2. Step 2: Convert to fraction form
    588.40/811.66 = 391.64/x
  3. Step 3: Cross multiply
    588.40x = 811.66 × 391.64
  4. Step 4: Simplify right side
    588.40x = 317,878.52
  5. Step 5: Solve for x
    x = 317,878.52/588.40
  6. Step 6: Final answer
    x = 540.24

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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.