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Finding the Fourth Proportional to 690.47, 952.82 and 395.72

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Solution

The fourth proportional to 690.47, 952.82 and 395.72 is: 546.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.47 : 952.82 = 395.72 : x
  2. Step 2: Convert to fraction form
    690.47/952.82 = 395.72/x
  3. Step 3: Cross multiply
    690.47x = 952.82 × 395.72
  4. Step 4: Simplify right side
    690.47x = 377,049.93
  5. Step 5: Solve for x
    x = 377,049.93/690.47
  6. Step 6: Final answer
    x = 546.08

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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.