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Finding the Fourth Proportional to 690.70, 953.36 and 396.07

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Solution

The fourth proportional to 690.70, 953.36 and 396.07 is: 546.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.70 : 953.36 = 396.07 : x
  2. Step 2: Convert to fraction form
    690.70/953.36 = 396.07/x
  3. Step 3: Cross multiply
    690.70x = 953.36 × 396.07
  4. Step 4: Simplify right side
    690.70x = 377,597.30
  5. Step 5: Solve for x
    x = 377,597.30/690.70
  6. Step 6: Final answer
    x = 546.69

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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.