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Finding the Fourth Proportional to 918.82, 1,378.75 and 371.39

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Solution

The fourth proportional to 918.82, 1,378.75 and 371.39 is: 557.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.82 : 1,378.75 = 371.39 : x
  2. Step 2: Convert to fraction form
    918.82/1,378.75 = 371.39/x
  3. Step 3: Cross multiply
    918.82x = 1,378.75 × 371.39
  4. Step 4: Simplify right side
    918.82x = 512,053.96
  5. Step 5: Solve for x
    x = 512,053.96/918.82
  6. Step 6: Final answer
    x = 557.30

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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.