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Finding the Fourth Proportional to 1,218.90, 1,825.11 and 640.56

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Solution

The fourth proportional to 1,218.90, 1,825.11 and 640.56 is: 959.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.90 : 1,825.11 = 640.56 : x
  2. Step 2: Convert to fraction form
    1,218.90/1,825.11 = 640.56/x
  3. Step 3: Cross multiply
    1,218.90x = 1,825.11 × 640.56
  4. Step 4: Simplify right side
    1,218.90x = 1,169,092.46
  5. Step 5: Solve for x
    x = 1,169,092.46/1,218.90
  6. Step 6: Final answer
    x = 959.14

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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.