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Finding the Fourth Proportional to 690.80, 953.12 and 395.96

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Solution

The fourth proportional to 690.80, 953.12 and 395.96 is: 546.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.80 : 953.12 = 395.96 : x
  2. Step 2: Convert to fraction form
    690.80/953.12 = 395.96/x
  3. Step 3: Cross multiply
    690.80x = 953.12 × 395.96
  4. Step 4: Simplify right side
    690.80x = 377,397.40
  5. Step 5: Solve for x
    x = 377,397.40/690.80
  6. Step 6: Final answer
    x = 546.32

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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.