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Finding the Fourth Proportional to 393.76, 590.40 and 356.80

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Solution

The fourth proportional to 393.76, 590.40 and 356.80 is: 534.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.76 : 590.40 = 356.80 : x
  2. Step 2: Convert to fraction form
    393.76/590.40 = 356.80/x
  3. Step 3: Cross multiply
    393.76x = 590.40 × 356.80
  4. Step 4: Simplify right side
    393.76x = 210,654.72
  5. Step 5: Solve for x
    x = 210,654.72/393.76
  6. Step 6: Final answer
    x = 534.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.