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Finding the Fourth Proportional to 485.91, 727.45 and 377.78

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Solution

The fourth proportional to 485.91, 727.45 and 377.78 is: 565.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.91 : 727.45 = 377.78 : x
  2. Step 2: Convert to fraction form
    485.91/727.45 = 377.78/x
  3. Step 3: Cross multiply
    485.91x = 727.45 × 377.78
  4. Step 4: Simplify right side
    485.91x = 274,811.48
  5. Step 5: Solve for x
    x = 274,811.48/485.91
  6. Step 6: Final answer
    x = 565.56

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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.