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Finding the Fourth Proportional to 486.90, 672.47 and 321.86

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Solution

The fourth proportional to 486.90, 672.47 and 321.86 is: 444.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.90 : 672.47 = 321.86 : x
  2. Step 2: Convert to fraction form
    486.90/672.47 = 321.86/x
  3. Step 3: Cross multiply
    486.90x = 672.47 × 321.86
  4. Step 4: Simplify right side
    486.90x = 216,442.47
  5. Step 5: Solve for x
    x = 216,442.47/486.90
  6. Step 6: Final answer
    x = 444.53

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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.