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Finding the Fourth Proportional to 918.22, 1,380.51 and 645.46

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Solution

The fourth proportional to 918.22, 1,380.51 and 645.46 is: 970.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.22 : 1,380.51 = 645.46 : x
  2. Step 2: Convert to fraction form
    918.22/1,380.51 = 645.46/x
  3. Step 3: Cross multiply
    918.22x = 1,380.51 × 645.46
  4. Step 4: Simplify right side
    918.22x = 891,063.98
  5. Step 5: Solve for x
    x = 891,063.98/918.22
  6. Step 6: Final answer
    x = 970.43

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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.