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Finding the Fourth Proportional to 439.58, 657.90 and 315.86

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Solution

The fourth proportional to 439.58, 657.90 and 315.86 is: 472.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.58 : 657.90 = 315.86 : x
  2. Step 2: Convert to fraction form
    439.58/657.90 = 315.86/x
  3. Step 3: Cross multiply
    439.58x = 657.90 × 315.86
  4. Step 4: Simplify right side
    439.58x = 207,804.29
  5. Step 5: Solve for x
    x = 207,804.29/439.58
  6. Step 6: Final answer
    x = 472.73

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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.