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Finding the Fourth Proportional to 918.78, 1,378.22 and 302.37

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Solution

The fourth proportional to 918.78, 1,378.22 and 302.37 is: 453.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.78 : 1,378.22 = 302.37 : x
  2. Step 2: Convert to fraction form
    918.78/1,378.22 = 302.37/x
  3. Step 3: Cross multiply
    918.78x = 1,378.22 × 302.37
  4. Step 4: Simplify right side
    918.78x = 416,730.87
  5. Step 5: Solve for x
    x = 416,730.87/918.78
  6. Step 6: Final answer
    x = 453.57

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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.