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Finding the Fourth Proportional to 638.34, 955.32 and 521.46

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Solution

The fourth proportional to 638.34, 955.32 and 521.46 is: 780.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.34 : 955.32 = 521.46 : x
  2. Step 2: Convert to fraction form
    638.34/955.32 = 521.46/x
  3. Step 3: Cross multiply
    638.34x = 955.32 × 521.46
  4. Step 4: Simplify right side
    638.34x = 498,161.17
  5. Step 5: Solve for x
    x = 498,161.17/638.34
  6. Step 6: Final answer
    x = 780.40

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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.