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Finding the Fourth Proportional to 2,153.28, 2,971.20 and 1,256.78

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Solution

The fourth proportional to 2,153.28, 2,971.20 and 1,256.78 is: 1,734.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.28 : 2,971.20 = 1,256.78 : x
  2. Step 2: Convert to fraction form
    2,153.28/2,971.20 = 1,256.78/x
  3. Step 3: Cross multiply
    2,153.28x = 2,971.20 × 1,256.78
  4. Step 4: Simplify right side
    2,153.28x = 3,734,144.74
  5. Step 5: Solve for x
    x = 3,734,144.74/2,153.28
  6. Step 6: Final answer
    x = 1,734.17

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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.