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Finding the Fourth Proportional to 690.90, 953.43 and 396.18

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Solution

The fourth proportional to 690.90, 953.43 and 396.18 is: 546.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.90 : 953.43 = 396.18 : x
  2. Step 2: Convert to fraction form
    690.90/953.43 = 396.18/x
  3. Step 3: Cross multiply
    690.90x = 953.43 × 396.18
  4. Step 4: Simplify right side
    690.90x = 377,729.90
  5. Step 5: Solve for x
    x = 377,729.90/690.90
  6. Step 6: Final answer
    x = 546.72

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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.