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Finding the Fourth Proportional to 457.80, 685.88 and 380.31

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Solution

The fourth proportional to 457.80, 685.88 and 380.31 is: 569.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.80 : 685.88 = 380.31 : x
  2. Step 2: Convert to fraction form
    457.80/685.88 = 380.31/x
  3. Step 3: Cross multiply
    457.80x = 685.88 × 380.31
  4. Step 4: Simplify right side
    457.80x = 260,847.02
  5. Step 5: Solve for x
    x = 260,847.02/457.80
  6. Step 6: Final answer
    x = 569.78

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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.