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Finding the Fourth Proportional to 934.65, 1,399.82 and 609.21

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Solution

The fourth proportional to 934.65, 1,399.82 and 609.21 is: 912.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.65 : 1,399.82 = 609.21 : x
  2. Step 2: Convert to fraction form
    934.65/1,399.82 = 609.21/x
  3. Step 3: Cross multiply
    934.65x = 1,399.82 × 609.21
  4. Step 4: Simplify right side
    934.65x = 852,781.30
  5. Step 5: Solve for x
    x = 852,781.30/934.65
  6. Step 6: Final answer
    x = 912.41

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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.