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Finding the Fourth Proportional to 589.80, 813.08 and 393.24

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Solution

The fourth proportional to 589.80, 813.08 and 393.24 is: 542.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.80 : 813.08 = 393.24 : x
  2. Step 2: Convert to fraction form
    589.80/813.08 = 393.24/x
  3. Step 3: Cross multiply
    589.80x = 813.08 × 393.24
  4. Step 4: Simplify right side
    589.80x = 319,735.58
  5. Step 5: Solve for x
    x = 319,735.58/589.80
  6. Step 6: Final answer
    x = 542.11

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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.