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Finding the Fourth Proportional to 611.79, 843.95 and 588.20

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Solution

The fourth proportional to 611.79, 843.95 and 588.20 is: 811.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.79 : 843.95 = 588.20 : x
  2. Step 2: Convert to fraction form
    611.79/843.95 = 588.20/x
  3. Step 3: Cross multiply
    611.79x = 843.95 × 588.20
  4. Step 4: Simplify right side
    611.79x = 496,404.23
  5. Step 5: Solve for x
    x = 496,404.23/611.79
  6. Step 6: Final answer
    x = 811.40

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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.