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Finding the Fourth Proportional to 1,418.70, 2,126.53 and 637.64

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Solution

The fourth proportional to 1,418.70, 2,126.53 and 637.64 is: 955.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.70 : 2,126.53 = 637.64 : x
  2. Step 2: Convert to fraction form
    1,418.70/2,126.53 = 637.64/x
  3. Step 3: Cross multiply
    1,418.70x = 2,126.53 × 637.64
  4. Step 4: Simplify right side
    1,418.70x = 1,355,960.59
  5. Step 5: Solve for x
    x = 1,355,960.59/1,418.70
  6. Step 6: Final answer
    x = 955.78

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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.