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Finding the Fourth Proportional to 625.68, 939.60 and 620.64

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Solution

The fourth proportional to 625.68, 939.60 and 620.64 is: 932.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.68 : 939.60 = 620.64 : x
  2. Step 2: Convert to fraction form
    625.68/939.60 = 620.64/x
  3. Step 3: Cross multiply
    625.68x = 939.60 × 620.64
  4. Step 4: Simplify right side
    625.68x = 583,153.34
  5. Step 5: Solve for x
    x = 583,153.34/625.68
  6. Step 6: Final answer
    x = 932.03

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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.