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Finding the Fourth Proportional to 615.35, 922.10 and 409.18

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Solution

The fourth proportional to 615.35, 922.10 and 409.18 is: 613.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.35 : 922.10 = 409.18 : x
  2. Step 2: Convert to fraction form
    615.35/922.10 = 409.18/x
  3. Step 3: Cross multiply
    615.35x = 922.10 × 409.18
  4. Step 4: Simplify right side
    615.35x = 377,300.53
  5. Step 5: Solve for x
    x = 377,300.53/615.35
  6. Step 6: Final answer
    x = 613.15

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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.