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Finding the Fourth Proportional to 457.81, 685.73 and 425.75

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Solution

The fourth proportional to 457.81, 685.73 and 425.75 is: 637.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.81 : 685.73 = 425.75 : x
  2. Step 2: Convert to fraction form
    457.81/685.73 = 425.75/x
  3. Step 3: Cross multiply
    457.81x = 685.73 × 425.75
  4. Step 4: Simplify right side
    457.81x = 291,943.99
  5. Step 5: Solve for x
    x = 291,943.99/457.81
  6. Step 6: Final answer
    x = 637.70

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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.