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Finding the Fourth Proportional to 615.40, 922.49 and 395.99

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Solution

The fourth proportional to 615.40, 922.49 and 395.99 is: 593.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.40 : 922.49 = 395.99 : x
  2. Step 2: Convert to fraction form
    615.40/922.49 = 395.99/x
  3. Step 3: Cross multiply
    615.40x = 922.49 × 395.99
  4. Step 4: Simplify right side
    615.40x = 365,295.17
  5. Step 5: Solve for x
    x = 365,295.17/615.40
  6. Step 6: Final answer
    x = 593.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.