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Finding the Fourth Proportional to 591.10, 815.68 and 394.58

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Solution

The fourth proportional to 591.10, 815.68 and 394.58 is: 544.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.10 : 815.68 = 394.58 : x
  2. Step 2: Convert to fraction form
    591.10/815.68 = 394.58/x
  3. Step 3: Cross multiply
    591.10x = 815.68 × 394.58
  4. Step 4: Simplify right side
    591.10x = 321,851.01
  5. Step 5: Solve for x
    x = 321,851.01/591.10
  6. Step 6: Final answer
    x = 544.50

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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.