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Finding the Fourth Proportional to 590.79, 815.20 and 354.69

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Solution

The fourth proportional to 590.79, 815.20 and 354.69 is: 489.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    590.79 : 815.20 = 354.69 : x
  2. Step 2: Convert to fraction form
    590.79/815.20 = 354.69/x
  3. Step 3: Cross multiply
    590.79x = 815.20 × 354.69
  4. Step 4: Simplify right side
    590.79x = 289,143.29
  5. Step 5: Solve for x
    x = 289,143.29/590.79
  6. Step 6: Final answer
    x = 489.42

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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.