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Finding the Fourth Proportional to 686.28, 1,027.80 and 541.56

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Solution

The fourth proportional to 686.28, 1,027.80 and 541.56 is: 811.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.28 : 1,027.80 = 541.56 : x
  2. Step 2: Convert to fraction form
    686.28/1,027.80 = 541.56/x
  3. Step 3: Cross multiply
    686.28x = 1,027.80 × 541.56
  4. Step 4: Simplify right side
    686.28x = 556,615.37
  5. Step 5: Solve for x
    x = 556,615.37/686.28
  6. Step 6: Final answer
    x = 811.06

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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.