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Finding the Fourth Proportional to 590.40, 813.72 and 393.56

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Solution

The fourth proportional to 590.40, 813.72 and 393.56 is: 542.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    590.40 : 813.72 = 393.56 : x
  2. Step 2: Convert to fraction form
    590.40/813.72 = 393.56/x
  3. Step 3: Cross multiply
    590.40x = 813.72 × 393.56
  4. Step 4: Simplify right side
    590.40x = 320,247.64
  5. Step 5: Solve for x
    x = 320,247.64/590.40
  6. Step 6: Final answer
    x = 542.42

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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.