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Finding the Fourth Proportional to 486.55, 670.79 and 374.69

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Solution

The fourth proportional to 486.55, 670.79 and 374.69 is: 516.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.55 : 670.79 = 374.69 : x
  2. Step 2: Convert to fraction form
    486.55/670.79 = 374.69/x
  3. Step 3: Cross multiply
    486.55x = 670.79 × 374.69
  4. Step 4: Simplify right side
    486.55x = 251,342.86
  5. Step 5: Solve for x
    x = 251,342.86/486.55
  6. Step 6: Final answer
    x = 516.58

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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.