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Finding the Fourth Proportional to 588.32, 811.99 and 389.90

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Solution

The fourth proportional to 588.32, 811.99 and 389.90 is: 538.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    588.32 : 811.99 = 389.90 : x
  2. Step 2: Convert to fraction form
    588.32/811.99 = 389.90/x
  3. Step 3: Cross multiply
    588.32x = 811.99 × 389.90
  4. Step 4: Simplify right side
    588.32x = 316,594.90
  5. Step 5: Solve for x
    x = 316,594.90/588.32
  6. Step 6: Final answer
    x = 538.13

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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.