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Finding the Fourth Proportional to 615.40, 922.78 and 230.60

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Solution

The fourth proportional to 615.40, 922.78 and 230.60 is: 345.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.40 : 922.78 = 230.60 : x
  2. Step 2: Convert to fraction form
    615.40/922.78 = 230.60/x
  3. Step 3: Cross multiply
    615.40x = 922.78 × 230.60
  4. Step 4: Simplify right side
    615.40x = 212,793.07
  5. Step 5: Solve for x
    x = 212,793.07/615.40
  6. Step 6: Final answer
    x = 345.78

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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.