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Finding the Fourth Proportional to 690.86, 953.37 and 396.18

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Solution

The fourth proportional to 690.86, 953.37 and 396.18 is: 546.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.86 : 953.37 = 396.18 : x
  2. Step 2: Convert to fraction form
    690.86/953.37 = 396.18/x
  3. Step 3: Cross multiply
    690.86x = 953.37 × 396.18
  4. Step 4: Simplify right side
    690.86x = 377,706.13
  5. Step 5: Solve for x
    x = 377,706.13/690.86
  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.