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Finding the Fourth Proportional to 590.90, 815.43 and 328.90

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Solution

The fourth proportional to 590.90, 815.43 and 328.90 is: 453.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    590.90 : 815.43 = 328.90 : x
  2. Step 2: Convert to fraction form
    590.90/815.43 = 328.90/x
  3. Step 3: Cross multiply
    590.90x = 815.43 × 328.90
  4. Step 4: Simplify right side
    590.90x = 268,190.85
  5. Step 5: Solve for x
    x = 268,190.85/590.90
  6. Step 6: Final answer
    x = 453.87

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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.