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Finding the Fourth Proportional to 690.67, 953.12 and 395.93

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Solution

The fourth proportional to 690.67, 953.12 and 395.93 is: 546.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.67 : 953.12 = 395.93 : x
  2. Step 2: Convert to fraction form
    690.67/953.12 = 395.93/x
  3. Step 3: Cross multiply
    690.67x = 953.12 × 395.93
  4. Step 4: Simplify right side
    690.67x = 377,367.27
  5. Step 5: Solve for x
    x = 377,367.27/690.67
  6. Step 6: Final answer
    x = 546.38

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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.