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Finding the Fourth Proportional to 591.38, 815.73 and 493.70

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Solution

The fourth proportional to 591.38, 815.73 and 493.70 is: 680.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.38 : 815.73 = 493.70 : x
  2. Step 2: Convert to fraction form
    591.38/815.73 = 493.70/x
  3. Step 3: Cross multiply
    591.38x = 815.73 × 493.70
  4. Step 4: Simplify right side
    591.38x = 402,725.90
  5. Step 5: Solve for x
    x = 402,725.90/591.38
  6. Step 6: Final answer
    x = 680.99

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Double scale
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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.