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Finding the Fourth Proportional to 918.67, 1,378.11 and 302.43

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Solution

The fourth proportional to 918.67, 1,378.11 and 302.43 is: 453.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.67 : 1,378.11 = 302.43 : x
  2. Step 2: Convert to fraction form
    918.67/1,378.11 = 302.43/x
  3. Step 3: Cross multiply
    918.67x = 1,378.11 × 302.43
  4. Step 4: Simplify right side
    918.67x = 416,781.81
  5. Step 5: Solve for x
    x = 416,781.81/918.67
  6. Step 6: Final answer
    x = 453.68

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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.