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Finding the Fourth Proportional to 399.60, 551.58 and 316.86

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Solution

The fourth proportional to 399.60, 551.58 and 316.86 is: 437.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.60 : 551.58 = 316.86 : x
  2. Step 2: Convert to fraction form
    399.60/551.58 = 316.86/x
  3. Step 3: Cross multiply
    399.60x = 551.58 × 316.86
  4. Step 4: Simplify right side
    399.60x = 174,773.64
  5. Step 5: Solve for x
    x = 174,773.64/399.60
  6. Step 6: Final answer
    x = 437.37

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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.