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Finding the Fourth Proportional to 690.47, 952.40 and 494.09

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Solution

The fourth proportional to 690.47, 952.40 and 494.09 is: 681.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.47 : 952.40 = 494.09 : x
  2. Step 2: Convert to fraction form
    690.47/952.40 = 494.09/x
  3. Step 3: Cross multiply
    690.47x = 952.40 × 494.09
  4. Step 4: Simplify right side
    690.47x = 470,568.85
  5. Step 5: Solve for x
    x = 470,568.85/690.47
  6. Step 6: Final answer
    x = 681.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.