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Finding the Fourth Proportional to 1,418.55, 1,956.94 and 921.21

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Solution

The fourth proportional to 1,418.55, 1,956.94 and 921.21 is: 1,270.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.55 : 1,956.94 = 921.21 : x
  2. Step 2: Convert to fraction form
    1,418.55/1,956.94 = 921.21/x
  3. Step 3: Cross multiply
    1,418.55x = 1,956.94 × 921.21
  4. Step 4: Simplify right side
    1,418.55x = 1,802,752.70
  5. Step 5: Solve for x
    x = 1,802,752.70/1,418.55
  6. Step 6: Final answer
    x = 1,270.84

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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.