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Finding the Fourth Proportional to 620.20, 932.10 and 609.40

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Solution

The fourth proportional to 620.20, 932.10 and 609.40 is: 915.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.20 : 932.10 = 609.40 : x
  2. Step 2: Convert to fraction form
    620.20/932.10 = 609.40/x
  3. Step 3: Cross multiply
    620.20x = 932.10 × 609.40
  4. Step 4: Simplify right side
    620.20x = 568,021.74
  5. Step 5: Solve for x
    x = 568,021.74/620.20
  6. Step 6: Final answer
    x = 915.87

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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.