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Finding the Fourth Proportional to 1,176.15, 1,765.28 and 628.80

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Solution

The fourth proportional to 1,176.15, 1,765.28 and 628.80 is: 943.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,176.15 : 1,765.28 = 628.80 : x
  2. Step 2: Convert to fraction form
    1,176.15/1,765.28 = 628.80/x
  3. Step 3: Cross multiply
    1,176.15x = 1,765.28 × 628.80
  4. Step 4: Simplify right side
    1,176.15x = 1,110,008.06
  5. Step 5: Solve for x
    x = 1,110,008.06/1,176.15
  6. Step 6: Final answer
    x = 943.76

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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.