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Finding the Fourth Proportional to 690.92, 953.58 and 396.20

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Solution

The fourth proportional to 690.92, 953.58 and 396.20 is: 546.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.92 : 953.58 = 396.20 : x
  2. Step 2: Convert to fraction form
    690.92/953.58 = 396.20/x
  3. Step 3: Cross multiply
    690.92x = 953.58 × 396.20
  4. Step 4: Simplify right side
    690.92x = 377,808.40
  5. Step 5: Solve for x
    x = 377,808.40/690.92
  6. Step 6: Final answer
    x = 546.82

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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.