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Finding the Fourth Proportional to 686.22, 1,028.72 and 524.62

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Solution

The fourth proportional to 686.22, 1,028.72 and 524.62 is: 786.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.22 : 1,028.72 = 524.62 : x
  2. Step 2: Convert to fraction form
    686.22/1,028.72 = 524.62/x
  3. Step 3: Cross multiply
    686.22x = 1,028.72 × 524.62
  4. Step 4: Simplify right side
    686.22x = 539,684.46
  5. Step 5: Solve for x
    x = 539,684.46/686.22
  6. Step 6: Final answer
    x = 786.47

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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.