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Finding the Fourth Proportional to 590.72, 815.20 and 328.74

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Solution

The fourth proportional to 590.72, 815.20 and 328.74 is: 453.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    590.72 : 815.20 = 328.74 : x
  2. Step 2: Convert to fraction form
    590.72/815.20 = 328.74/x
  3. Step 3: Cross multiply
    590.72x = 815.20 × 328.74
  4. Step 4: Simplify right side
    590.72x = 267,988.85
  5. Step 5: Solve for x
    x = 267,988.85/590.72
  6. Step 6: Final answer
    x = 453.66

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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.