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Finding the Fourth Proportional to 615.38, 921.63 and 518.18

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Solution

The fourth proportional to 615.38, 921.63 and 518.18 is: 776.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.38 : 921.63 = 518.18 : x
  2. Step 2: Convert to fraction form
    615.38/921.63 = 518.18/x
  3. Step 3: Cross multiply
    615.38x = 921.63 × 518.18
  4. Step 4: Simplify right side
    615.38x = 477,570.23
  5. Step 5: Solve for x
    x = 477,570.23/615.38
  6. Step 6: Final answer
    x = 776.06

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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.