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Finding the Fourth Proportional to 457.56, 684.77 and 389.88

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Solution

The fourth proportional to 457.56, 684.77 and 389.88 is: 583.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.56 : 684.77 = 389.88 : x
  2. Step 2: Convert to fraction form
    457.56/684.77 = 389.88/x
  3. Step 3: Cross multiply
    457.56x = 684.77 × 389.88
  4. Step 4: Simplify right side
    457.56x = 266,976.18
  5. Step 5: Solve for x
    x = 266,976.18/457.56
  6. Step 6: Final answer
    x = 583.48

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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.