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Finding the Fourth Proportional to 638.88, 956.70 and 457.44

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Solution

The fourth proportional to 638.88, 956.70 and 457.44 is: 685.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.88 : 956.70 = 457.44 : x
  2. Step 2: Convert to fraction form
    638.88/956.70 = 457.44/x
  3. Step 3: Cross multiply
    638.88x = 956.70 × 457.44
  4. Step 4: Simplify right side
    638.88x = 437,632.85
  5. Step 5: Solve for x
    x = 437,632.85/638.88
  6. Step 6: Final answer
    x = 685.00

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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.