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Finding the Fourth Proportional to 690.49, 953.01 and 395.95

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Solution

The fourth proportional to 690.49, 953.01 and 395.95 is: 546.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.49 : 953.01 = 395.95 : x
  2. Step 2: Convert to fraction form
    690.49/953.01 = 395.95/x
  3. Step 3: Cross multiply
    690.49x = 953.01 × 395.95
  4. Step 4: Simplify right side
    690.49x = 377,344.31
  5. Step 5: Solve for x
    x = 377,344.31/690.49
  6. Step 6: Final answer
    x = 546.49

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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.