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Finding the Fourth Proportional to 1,256.20, 1,731.78 and 862.60

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Solution

The fourth proportional to 1,256.20, 1,731.78 and 862.60 is: 1,189.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.20 : 1,731.78 = 862.60 : x
  2. Step 2: Convert to fraction form
    1,256.20/1,731.78 = 862.60/x
  3. Step 3: Cross multiply
    1,256.20x = 1,731.78 × 862.60
  4. Step 4: Simplify right side
    1,256.20x = 1,493,833.43
  5. Step 5: Solve for x
    x = 1,493,833.43/1,256.20
  6. Step 6: Final answer
    x = 1,189.17

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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.