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Finding the Fourth Proportional to 1,018.46, 1,404.32 and 645

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Solution

The fourth proportional to 1,018.46, 1,404.32 and 645 is: 889.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.46 : 1,404.32 = 645 : x
  2. Step 2: Convert to fraction form
    1,018.46/1,404.32 = 645/x
  3. Step 3: Cross multiply
    1,018.46x = 1,404.32 × 645
  4. Step 4: Simplify right side
    1,018.46x = 905,786.40
  5. Step 5: Solve for x
    x = 905,786.40/1,018.46
  6. Step 6: Final answer
    x = 889.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.