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Finding the Fourth Proportional to 613.71, 920.45 and 203.11

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Solution

The fourth proportional to 613.71, 920.45 and 203.11 is: 304.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.71 : 920.45 = 203.11 : x
  2. Step 2: Convert to fraction form
    613.71/920.45 = 203.11/x
  3. Step 3: Cross multiply
    613.71x = 920.45 × 203.11
  4. Step 4: Simplify right side
    613.71x = 186,950.81
  5. Step 5: Solve for x
    x = 186,950.81/613.71
  6. Step 6: Final answer
    x = 304.62

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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.