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Finding the Fourth Proportional to 628.60, 855.76 and 628.60

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Solution

The fourth proportional to 628.60, 855.76 and 628.60 is: 855.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.60 : 855.76 = 628.60 : x
  2. Step 2: Convert to fraction form
    628.60/855.76 = 628.60/x
  3. Step 3: Cross multiply
    628.60x = 855.76 × 628.60
  4. Step 4: Simplify right side
    628.60x = 537,930.74
  5. Step 5: Solve for x
    x = 537,930.74/628.60
  6. Step 6: Final answer
    x = 855.76

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.