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Finding the Fourth Proportional to 1,553.29, 2,143.87 and 955.78

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Solution

The fourth proportional to 1,553.29, 2,143.87 and 955.78 is: 1,319.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.29 : 2,143.87 = 955.78 : x
  2. Step 2: Convert to fraction form
    1,553.29/2,143.87 = 955.78/x
  3. Step 3: Cross multiply
    1,553.29x = 2,143.87 × 955.78
  4. Step 4: Simplify right side
    1,553.29x = 2,049,052.57
  5. Step 5: Solve for x
    x = 2,049,052.57/1,553.29
  6. Step 6: Final answer
    x = 1,319.17

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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.